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71 results on '"Valeria Braccini"'

1. Unveiling intrinsic material and extrinsic pinning dimensionality in superconductors: Why Fe(Se,Te) is able to mimic YBCO

Author

Gaia Grimaldi, Masood R. Khan, Antonio Leo, Mario Scuderi, Francesco Rizzo, Andrea Augieri, Giuseppe Celentano, Armando Galluzzi, Michela Iebole, Massimiliano Polichetti, Angela Nigro, and Valeria Braccini

Subjects
Physics, Condensed matter physics, Superconductivity, Science
Abstract

Summary: Discovery of iron-based superconductors paved the way to a competitor of high-temperature superconductors, easier to produce, better performing in high fields, and promising to be less expensive. Critical parameters are investigated by resistivity measurements as a function of temperature, field, and angle R(T,H,θ). This work presents a deep analysis of H-θ phase diagram of PLD-processed Fe(Se,Te) superconducting films, thus revealing material and pinning anisotropy at once. By selecting different thresholds along the R(T,H,θ) curves, all possible regimes emerge. Surprisingly, anisotropy arises moving from the upper critical field toward the irreversibility line: gradually a non-monotonous transition from 3D to 2D, and backward to 3D occurs. Although Fe(Se,Te) appears as a 3D superconductor, its anisotropic pinning landscape shows up similarities with an intrinsic layered superconductor and Fe(Se,Te) definitively mimics YBCO. We propose a general method to disentangle, in any other superconductor, material dimensionality and pinning anisotropy that are key constraints for applications.

Published
2024
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2. Fe(Se,Te) Thin Films Deposited through Pulsed Laser Ablation from Spark Plasma Sintered Targets

Author

Michela Iebole, Valeria Braccini, Cristina Bernini, Andrea Malagoli, Nicola Manca, Alberto Martinelli, Matteo Cialone, Marina Putti, Shiv J. Singh, Giovanna Latronico, and Paolo Mele

Subjects
iron-based superconductors, thin films, pulsed laser ablation, spark plasma synthesis, critical current density, Technology, Electrical engineering. Electronics. Nuclear engineering, TK1-9971, Engineering (General). Civil engineering (General), TA1-2040, Microscopy, QH201-278.5, Descriptive and experimental mechanics, QC120-168.85
Abstract

Iron-based superconductors are under study for their potential for high-field applications due to their excellent superconducting properties such as low structural anisotropy, large upper critical fields and low field dependence of the critical current density. Between them, Fe(Se,Te) is simple to be synthesized and can be fabricated as a coated conductor through laser ablation on simple metallic templates. In order to make all the steps simple and fast, we have applied the spark plasma sintering technique to synthesize bulk Fe(Se,Te) to obtain quite dense polycrystals in a very short time. The resulting polycrystals are very well connected and show excellent superconducting properties, with a critical temperature onset of about 16 K. In addition, when used as targets for pulsed laser ablation, good thin films are obtained with a critical current density above 105 A cm−2 up to 16 T.

Published
2024
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3. Nanoscale analysis of superconducting Fe(Se,Te) epitaxial thin films and relationship with pinning properties

Author

Mario Scuderi, Ilaria Pallecchi, Antonio Leo, Angela Nigro, Gaia Grimaldi, Carlo Ferdeghini, Corrado Spinella, Marco Guidolin, Antonio Trotta, and Valeria Braccini

Subjects
Medicine, Science
Abstract

Abstract The process of developing superconducting materials for large scale applications is mainly oriented to optimize flux pinning and the current carrying capability. A powerful approach to investigate pinning properties is to combine high resolution imaging with transport measurements as a function of the magnetic field orientation, supported by a pinning modelling. We carry out Transmission Electron Microscopy, Electron Energy Loss Spectroscopy and critical current measurements in fields up to 16 T varying the angle between the field and c-axis of Fe(Se,Te) epitaxial thin films deposited on CaF2 substrates. We find evidence of nanoscale domains with different Te:Se stoichiometry and/or rotated and tilted axes, as well as of lattice distortions and two-dimensional defects at the grain boundaries. These elongated domains are tens of nm in size along the in-plane axes. We establish a correlation between these observed microstructural features and the pinning properties, specifically strongly enhanced pinning for the magnetic field oriented in-plane and pinning emerging at higher fields for out-of-plane direction. These features can be accounted for within a model where pinning centers are local variations of the critical temperature and local variations of the mean free path, respectively. The identification of all these growth induced defects acting as effective pinning centers may provide useful information for the optimization of Fe(Se,Te) coated conductors.

Published
2021
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4. Effective Magnetic Field Dependence of the Flux Pinning Energy in FeSe0.5Te0.5 Superconductor

Author

Masood Rauf Khan, Antonio Leo, Angela Nigro, Armando Galluzzi, Massimiliano Polichetti, Valeria Braccini, Matteo Cialone, Mario Scuderi, and Gaia Grimaldi

Subjects
iron-based superconductors, pinning properties, flux pinning energy, Technology, Electrical engineering. Electronics. Nuclear engineering, TK1-9971, Engineering (General). Civil engineering (General), TA1-2040, Microscopy, QH201-278.5, Descriptive and experimental mechanics, QC120-168.85
Abstract

The role of a layered structure in superconducting pinning properties is still at a debate. The effects of the vortex shape, which can assume for example a staircase form, could influence the interplay with extrinsic pinning coming from the specific defects of the material, thus inducing an effective magnetic field dependence. To enlighten this role, we analysed the angular dependence of flux pinning energy U(H,θ) as a function of magnetic field in FeSe0.5Te0.5 thin film by considering the field components along the ab-plane of the crystal structure and the c-axis direction. U(H,θ) has been evaluated from magneto-resistivity measurements acquired at different orientations between the applied field up to 16 T and FeSe0.5Te0.5 thin films grown on a CaF2 substrate. We observed that the U(H,θ) shows an anisotropic trend as a function of both the intensity and the direction of the applied field. Such a behaviour can be correlated to the presence of extended defects elongated in the ab-planes, thus mimicking a layered superconductor, as we observed in the microstructure of the compound. The comparison of FeSe0.5Te0.5 with other superconducting materials provides a more general understanding on the flux pinning energy in layered superconductors.

Published
2021
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5. Current Induced Resistive State in Fe(Se,Te) Superconducting Nanostrips

Author

Ciro Nappi, Carlo Camerlingo, Emanuele Enrico, Emilio Bellingeri, Valeria Braccini, Carlo Ferdeghini, and Ettore Sarnelli

Subjects
Medicine, Science
Abstract

Abstract We study the current-voltage characteristics of Fe(Se,Te) thin films deposited on CaF2 substrates in form of nanostrips (width w ~ λ, λ the London penetration length). In view of a possible application of these materials to superconductive electronics and micro-electronics we focus on transport properties in small magnetic field, the one generated by the bias current. From the characteristics taken at different temperatures we derive estimates for the pinning potential U and the pinning potential range δ for the magnetic flux lines (vortices). Since the sample lines are very narrow, the classical creep flow model provides a sufficiently accurate interpretation of the data only when the attractive interaction between magnetic flux lines of opposite sign is taken into account. The observed voltages and the induced depression of the critical current of the nanostrips are compatible with the presence of a low number ( $$\lesssim 10$$ < ˜ 10 ) magnetic field lines at the equilibrium, a strongly inhomogeneous current density distribution at the two ends of the strips and a reduced Bean Livingston barrier. In particular, we argue that the sharp corners defining the bridge geometry represent points of easy magnetic flux lines injection. The results are relevant for creep flow analysis in superconducting Fe(Se,Te) nanostrips.

Published
2017
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6. Proton Irradiation Effects on the Superconducting Properties of Fe(Se,Te) Thin Films

Author

Daniele Torsello, Michela Fracasso, Roberto Gerbaldo, Gianluca Ghigo, Francesco Laviano, Andrea Napolitano, Michela Iebole, Matteo Cialone, Nicola Manca, Alberto Martinelli, Laura Piperno, Valeria Braccini, Antonio Leo, Gaia Grimaldi, Angelo Vannozzi, Giuseppe Celentano, Marina Putti, and Laura Gozzelino

Subjects
Critical current, strain, critical temperature, critical fields, iron-based superconductors, proton irradiation, radiation hardness, Electrical and Electronic Engineering, Condensed Matter Physics, Electronic, Optical and Magnetic Materials
Published
2022

7. Weak or Strong Anisotropy in Fe(Se,Te) Superconducting Thin Films Made of Layered Iron-Based Material?

Author

Nadia Martucciello, Sandro Pace, Armando Galluzzi, Angela Nigro, Massimiliano Polichetti, J. C. Villegier, Gaia Grimaldi, C. Ferdeghini, E. Bellingeri, Valeria Braccini, and Antonio Leo

Subjects
High-temperature superconductivity, Materials science, Magnetoresistance, Substrate (electronics), Superconducting magnet, 01 natural sciences, law.invention, law, Condensed Matter::Superconductivity, 0103 physical sciences, Electronic, upper critical magnetic fields, Optical and Magnetic Materials, Electrical and Electronic Engineering, Thin film, 010306 general physics, Anisotropy, iron based materials, superconducting films, Superconductivity, Condensed matter physics, Anisotropy factor, Electronic, Optical and Magnetic Materials, Condensed Matter Physics, Magnetic field
Abstract

We study the temperature dependence of the upper critical magnetic field Hc2 in a layered iron-based superconducting (IBS) material of the 11-family, namely the Fe(Se,Te) thin film grown on CaF2 substrate. On the basis of intrinsic anisotropy as well as system dimensionality, it turns useful to make a comparison with an ultrathin film conventional low temperature superconductors (LTS) such as NbN, mostly used for device applications. We compare the anisotropy factors as a function of temperature and magnetic field. Both materials present a peculiar behavior: The LTS behaves as a strong anisotropic system, whereas the IBS shows very weak anisotropic features. The strong NbN character can be directly ascribed to the dimensionality of the ultrathin film employed, thus revealing a geometry effect. The weak Fe(Se,Te) trend should be related to its layered crystallographic structure, thus probing an intrinsic origin of its anisotropy. These characteristics become relevant for the potential application of this material in coated conductor technology.

Published
2019

8. Effective magnetic field dependence of the flux pinning energy in fese0.5te0.5 superconductor

Author

Mario Scuderi, Armando Galluzzi, Matteo Cialone, Massimiliano Polichetti, Antonio Leo, Valeria Braccini, Angela Nigro, Gaia Grimaldi, and Masood Rauf Khan

Subjects
Technology, Materials science, Flux pinning, Field (physics), Flux pinning energy, Iron-based superconductors, Pinning properties, Article, Condensed Matter::Superconductivity, General Materials Science, Thin film, Anisotropy, Superconductivity, Microscopy, QC120-168.85, Condensed matter physics, QH201-278.5, Engineering (General). Civil engineering (General), Microstructure, TK1-9971, Magnetic field, Vortex, Descriptive and experimental mechanics, Electrical engineering. Electronics. Nuclear engineering, TA1-2040
Abstract

The role of a layered structure in superconducting pinning properties is still at a debate. The effects of the vortex shape, which can assume for example a staircase form, could influence the interplay with extrinsic pinning coming from the specific defects of the material, thus inducing an effective magnetic field dependence. To enlighten this role, we analysed the angular dependence of flux pinning energy U(H,θ) as a function of magnetic field in FeSe0.5Te0.5 thin film by considering the field components along the ab-plane of the crystal structure and the c-axis direction. U(H,θ) has been evaluated from magneto-resistivity measurements acquired at different orientations between the applied field up to 16 T and FeSe0.5Te0.5 thin films grown on a CaF2 substrate. We observed that the U(H,θ) shows an anisotropic trend as a function of both the intensity and the direction of the applied field. Such a behaviour can be correlated to the presence of extended defects elongated in the ab-planes, thus mimicking a layered superconductor, as we observed in the microstructure of the compound. The comparison of FeSe0.5Te0.5 with other superconducting materials provides a more general understanding on the flux pinning energy in layered superconductors.

Published
2021

9. HE-LHC: The High-Energy Large Hadron Collider Future Circular Collider Conceptual Design Report Volume 4

Author

Pushpalatha C Bhat, B. Seeber, C. Pagliarone, Marco Statera, Victor P. Goncalves, Daria Astapovych, W. Bartmann, S. Iwamoto, M. Mentink, Alessandro Tricoli, E. R. Bielert, Laurent Chevalier, Patrick Koppenburg, Marco Calviani, C. Montag, P. Spiller, Jan Uythoven, P. Di Nezza, G. Guillermo Canton, B. Sailer, Markus Elsing, Sara Khatibi, Luca Vecchi, Luigi Palumbo, J. P. Penttinen, T. Podzorny, Maneesh Kumar, J. M. Rifflet, C. Kotnig, Jean Zinn-Justin, Christopher B. Verhaaren, A. Chernoded, Alessandro Bertarelli, L. M. Tkachenko, C. Koeberl, P. J. Mallon, M. Takeuchi, W. Venturini Delsolaro, G. Lamanna, S. Weinzierl, J. Gao, W. Kaabi, David D'Enterria, D. Barna, Paolo Castelnovo, Rajat Gupta, Oliver Boine-Frankenheim, Adarsh Pyarelal, Andreas Salzburger, Tessa Charles, M.E. Biagini, O. Panella, M. Stuart, A. Kollegger, V. Garcia Diaz, Olcay Bolukbasi, Maurizio Pierini, H. Aksakal, Tord Riemann, Abhishek M. Iyer, V. Shiltsev, D. Buttazzo, J. Blümlein, Prateek Agrawal, L. Sestini, Martin Bauer, Felicitas Pauss, S. Fiorendi, F. Bossu, Marco Nardecchia, C. Leonidopoulos, Wojciech Kotlarski, A. Saba, I. Bautista-Guzmán, W. Hillert, Giorgio Ambrosio, T. Lehtinen, Michael Andrew Parker, Silvia Taroni, Gian F. Giudice, Ph. Lebrun, Johann A. Briffa, T. Risselada, Giuseppe Lerner, A. Lechner, L. S. Miralles, M. Kuze, J. M. Valet, P. S. B. Dev, S. Holleis, Ph. Schwemling, M. Biglietti, S. Banerjee, Thomas Schörner-Sadenius, A. Sanz Ull, V. Tikhomirov, S. Savelyeva, Jiayin Gu, D. Zhou, Federico Ravotti, S. A. Bogacz, Daniele Mirarchi, R. Tomás García, Yann Coadou, F. Yu, Y. Cai, T. Lari, F. Holdener, D. Shwartz, C. Bhat, Ramesh Gupta, Markus Klute, E. Palmieri, P. Collier, Branislav Sitar, Yves Sirois, Livio Fanò, S. Rojas-Torres, E. Locci, Ruben Garcia Alia, I. Božović Jelisavić, R. Chehab, J. A. Aguilar-Saavedra, M. Pasquali, A. Di Cicco, Bernhard Auchmann, Klaus Heinemann, Alessia Tricomi, D. Lucchesi, B. Haerer, M. Morrone, Paolo Giacomelli, Sonia Carra, A. Senol, Ivan Koop, Luca Silvestrini, Anna Stakia, Heather Gray, E. Skordis, A. D. Kovalenko, Paul Langacker, R. Li, Bernardo Bordini, R. Rata, Arjan Verweij, Shehu S. AbdusSalam, Andrey Karyukhin, U. van Rienen, Gianluigi Arduini, Bernhard Holzer, S. A. Nikitin, S. S. Kozub, Satoshi Mishima, B. Di Micco, S. Izquierdo Bermudez, N. Pukhaeva, Nigel Watson, F. Prino, Jean-Michel Sallese, Sotirios Vlachos, Alessandro Vicini, A. Valassi, Daniel Treille, F. Dordei, A. M. Fernandez Navarro, B. Dziewit, Marcello Abbrescia, J. M. Hauptman, I. Chaikovska, Paolo Giubellino, Michael J. Baker, V.V. Kashikhin, Friedrich Lackner, Filippo Sala, A. Langner, D. Pulikowski, H. Eriksson, Matteo Turri, Andrea Wulzer, M. Aiba, Lisa Borgonovi, I. Morozov, V. Haurylavets, J. F. Croteau, S. Boselli, L. A. Gonzalez Gomez, Claudia Tambasco, F. Mahmoudi, Sébastien Descotes-Genon, A. Luciani, Pavel Piminov, M. Varasteh, T. Herzig, Sandra Aumon, Cristina Bernini, Joseph Bramante, Roberta Arnaldi, G. Zick, Daniel Schulte, R. Santoro, Anna Kulesza, I. Turk Cakir, M. Nonis, Silvia Posada Arias, Livia Soffi, T. Wojtoń, E. Cennini, Florian Bauer, B. Rousset, J.-L. Grenard, C. Neubüser, Frederic Derue, Loukas Gouskos, Rainer Wallny, G. Calderini, M. Merk, M. Mühlegger, Roberto Cimino, M. Ramsey-Musolf, P. Rebello Teles, Mario Galanti, Mikhail Shaposhnikov, A. Andreazza, Maria Vittoria Garzelli, Masaya Ishino, José W. F. Valle, Colin Bernet, G. Velev, Cristina Botta, E. Fischer, J. Malclés, Giuseppe Montenero, Tripurari Srivastava, E. Renner, Shahnam Gorgi Zadeh, D. Cantore-Cavalli, Paul Laycock, J. Komppula, Simon C. Hopkins, Helmut Burkhardt, Eric Lancon, I. Aichinger, Andre Sznajder, F. Bordry, Massimo Giovannozzi, Aidan Robson, Anna Giunta, A. Carvalho, S. Farinon, Daniel Wollmann, M. Fouaidy, Martti Raidal, R. Gerard, Giovanni Volpini, U. Niedermayer, A. Alekou, Alexander J.G. Lunt, Vincenzo Cavasinni, Andrzej Siodmok, U. Kaya, Matthias Schott, Marumi Kado, S. A. Arsenyev, José Zurita, John Osborne, Patrick Meade, Gianmarco Bovone, G. Li, Klaus Schlenga, Antti Stenvall, D. Duellmann, Werner Riegler, I. Garzia, Yasuyuki Okumura, G. Pikurs, F. Maltoni, Massimo Sorbi, M. Arzeo, B. Strauss, Y. W. Baek, Mauro Chiesa, K. Ilyina-Brunner, Javier L. Albacete, R. Farinelli, C. Pes, Nicolas Morange, S. M. Zernov, U. Wagner, Emmanuelle Perez, G. G. Da Silveira, J. Neundorf, Néstor Armesto, T. Hahn, Roman N. Lee, Roderik Bruce, B. Y. Sharkov, T. du Pree, G. Cibinetto, Evelin Meoni, R. Rinaldesi, James A. Ellison, Radim Slovak, Silvia Franchino, Mikko Laine, T. Pugnat, S. P. Das, Yuji Enari, Emanuela Barzi, Cihan Bayindir, R. Boels, Jana Faltova, M. Moreno Llácer, Scott A. Yost, Michael Spannowsky, Florian Burkart, Marcin Chrzaszcz, K. Suzuki, Luca Trentadue, S. Masciocchi, Gilad Perez, Steve Peggs, K. Sugita, Eleonora Belli, Carmine Senatore, K. Y. Oyulmaz, Aldo Deandrea, Irakli Minashvili, Desmond P. Barber, M. I. Martínez-Hernández, A. Apyan, S. Petracca, Mikael Chala, Urs Achim Wiedemann, T. Sian, Olivier Deschamps, R. Monge, G. Avrillaud, Jan Kieseler, Hubert Spiesberger, J. Maitre, G. D. Shirkov, M. Hofer, Emanuela Sirtori, Sinan Kuday, Kirill Skovpen, Sara Casalbuoni, Johann Usovitsch, N. Chen, G. Tejeda-Muñoz, F. Bellini, E. Chyhyrynets, Michael Stöger-Pollach, M. Vogel, J. G. Mendes Saraiva, A. Rivetti, M. Podeur, Luc Poggioli, V. A. Gromov, R. Sirvinskaite, S. B. Leith, Giancarlo D'Ambrosio, Tony Price, Philippe Mermod, Rabindra N. Mohapatra, T. Mitshuhashi, Koji Terashi, Leonel Ferreira, L. Vale Silva, N. Muchnoi, J. L. Stanyard, Thomas Marriott-Dodington, A. Andriatis, Oleg Solovyanov, A. Daljevec, A. Butterworth, S. Myers, D. Chanal, Tatiana Pieloni, M. Rodríguez-Cahuantzi, G. Nardini, D. Boscherini, Kazuhito Ohmi, James Molson, S. Kowalski, Christoph Haberstroh, Martin Aleksa, K. Kershaw, M. Mulder, Leonid Rivkin, G. Vorotnikov, Luigi Salvatore Esposito, J. Kalinowski, Michele Cascella, Francesco Giffoni, Alessandro Polini, Georges Azuelos, M. Prioli, Wolfgang Altmannshofer, S. K. Patra, H. J. He, J. J. Aguilera-Verdugo, Hannu Paukkunen, P. Chomaz, Shoji Asai, Nicolas Magnin, Gavin P. Salam, R. Wang, F. Avino, Alexander Romanenko, A. Rossi, Steve Muanza, Richard Ruiz, Dmitry Teytelman, S. Klöppel, S. Atieh, M. Mohammadi Najafabadi, L. Apolinario, Andrea Tesi, M. Maggiora, A. Falkowski, Janusz Gluza, M. Sauvain, Hamzeh Khanpour, S. Chance, Ansgar Denner, Ma. Greco, Andreas Papaefstathiou, Manuela Boscolo, Joydeep Chakrabortty, E. Franco, R. R. Bosley, G. Peón, Fred Olness, Simone Alioli, Andrea Gaddi, M. K. Sullivan, M. Segreti, M. Panareo, Florian Goertz, Z. G. Zhao, H. Chanal, O. Martin, P. Azzurri, Agnieszka Chmielinska, M. Kordiaczyńska, O. Brunner, J. Von Ahnen, Jose Santiago, K. Foraz, Y. Alexahin, Marcello Mannelli, Christian Schwanenberger, S. Ganjour, Simone Marzani, T. M. Taylor, S. Di Vita, J. Womersley, I. Karpov, Valentina Morretta, Saverio D'Auria, Patrick Draper, B. Hacışahinoğlu, E. Gorini, Andrew J. Long, S. La Mendola, G. Zevi Dell Porta, I. Abdyukhanov, M. Cobal, Luca Marzola, E. Rochepault, A. Kusina, German Rodrigo, R. Schmidt, Jan Steggemann, E. Premat, P. Slavich, F. Gianotti, P. Jarry, Ram Krishna Dewanjee, L. Felsberger, T. Martinez, A. Niemi, Jürgen Reuter, P. A. Bruckman de Renstrom, Ryu Sawada, J. T. Childers, Gelsomina Catalano, P. Barjhoux, O. R. Blanco-García, Pilar Hernández, H. Correia-Rodrigues, V. Ippolito, S. De Curtis, Juan Rojo, Ayberk Yilmaz, S. Baird, Morteza Khatiri Yanehsari, Enrico Scomparin, Daniel Appelö, J. Kozaczuk, Matthew Jones, B. Caiffi, C. Del Bo, Susanna Guiducci, Giuliano Panico, M. Knecht, J. Coupard, M. Ciuchini, H. Kritscher, Claire Gwenlan, P. Costa Pinto, Thibaut Lefèvre, N. Bellegarde, Christian Scheuerlein, P. Ferreira da Silva, M. Verducci, X. Ruan, H. Pikhartova, Juan M. O'Callaghan, Kazuro Furukawa, D. Saez de Jauregui, Maria Rescigno, Stephan Eisenhardt, Andrea Dainese, Z. Drásal, G. H. Corral, J. M. Camalich, John Ellis, E. Gabrielli, L. Rumyantsev, A. Caliskan, K. Brunner, K. Tang, P. Sopicki, J. Fan, Marcin Kucharczyk, S. Gorgi Zadeh, Carlos A. Salgado, Simone Bologna, Y. Muttoni, A. Chancé, Patrick Jenny, Mark Boland, G. Yang, G. Wilkinson, Roger J. Hernández-Pinto, M. Novák, Gennady Stupakov, E. Jensen, Lance D. Cooley, Torbjörn Sjöstrand, S. Su, Matthew Luzum, J. Casas, Per Osland, T. Robens, Oscar A. Sampayo, Evgeny Levichev, P. N. Ratoff, G. Rolandi, M. A. Valdivia Garcia, Anthony Keith Morley, L. van Riesen-Haupt, A. Sublet, M. A. Mazzoni, J.L. Gutierrez, A. Abramov, Abbas Kenan Ciftci, A. Provino, L. Delle Rose, John Fox, Barry M. Dillon, V. Smirnov, G. N. Taylor, Anke-Susanne Müller, C. Pira, Fulvio Piccinini, A. Faus-Golfe, Pietro Antonioli, S. Sanfilippo, Julien Cogan, A. Ribon, Andrew Hutton, Frank Zimmermann, Lev Dudko, Erez Etzion, J. Polinski, G. Bencivenni, M. Gil Costa, L. K. Gladilin, Yannis Papaphilippou, Michael Spira, Maria Paola Lombardo, M. Fiascaris, Darius A. Faroughy, S. O. Kara, Peter Braun-Munzinger, A. Wohlfahrt, A. A. Krasnov, S.A. Gourlay, W. Da Silva, Jacqueline Keintzel, Radja Boughezal, Renat Sadykov, L. R. Sulak, Valentin V. Khoze, T. Tydecks, S. Puławski, Daniel de Florian, Pedro Schwaller, A. Akay, Nicola Serra, Sukanta Dutta, Christophe Royon, Alessandro Ricci, A. Kuendig, C. G. Honorato, K. Kołodziej, L. Deniau, Michael Kramer, J. Ferradas Troitino, A. Arbey, A. M. Staśto, Marcel Demarteau, Ralph Aßmann, O. Grimm, D. Forkel-Wirth, Owain Rhodri Jones, A. M. Kolano, G. Chiarello, William Trischuk, Andrea Dell'Acqua, Elisabetta Gallo, H. Song, Frank Petriello, N. Ibarrola, C. Colldelram, A. I. Ryazanov, A. Meier, Phillip Allport, J. de Blas, S. Chattopadhyay, Massimo Florio, X. Jiang, Bertrand Baudouy, T. Otto, Tevong You, Christoph Englert, Roberto Pittau, G. M. Bilei, Matthew McCullough, N. S. Ramírez-Uribe, J. Charles, Amalia Ballarino, Federico Antinori, A. V. Kotwal, P. Le Guen, Berndt Müller, Chiara Roda, Xavier Buffat, D. K. Hong, Matthias Liepe, G. Gorine, V. A. Okorokov, D. Bozzini, N. Simand, Giuseppe Francesco Tartarelli, C. Marquet, R. Contino, A. M. Teixeira, R. Trant, Roberto Losito, M. Quispe, Valery I. Telnov, Helga Timko, D. Lissauer, Giulio Aielli, Giorgio Chiarelli, M. J. Baldwin, A. Winter, X. Sarasola, E. E. Boos, Aleandro Nisati, Cedric Garion, Monica D'Onofrio, S. M. Gascon-Shotkin, Daniele Barducci, G. Rosaz, Nathaniel Craig, L. D’Aloia Schwartzentruber, A. Falou, A. Henriques, Tobias Hurth, Michael Eisterer, Andreas Grau, Austin Ball, D. Delikaris, P. A. McIntosh, E. Graverini, Kadri Ozdemir, F. Valchkova, Marco Zanetti, Guenakh Mitselmakher, S. Albergo, Peter Levai, Caterina Vernieri, F. Stivanello, Michael Barnes, Henri Bachacou, Daniel Fournier, L. T. Wang, D. Boutin, S. Moretti, B. Riemann, Michael Murray, Aleksandr Azatov, C. T. A. Cook, Valentina Maria Cairo, J. B. De Vivie De Regie, H. Schmickler, M. Schenk, Georgios Voutsinas, André Schöning, S. G. Bondarenko, Giorgio Bellomo, Andrei Seryi, Jane Nachtman, Clement Helsens, E. De Lucia, Jakob Salfeld-Nebgen, Lorenzo Pezzotti, Z. Townsend, B. Dalena, Mogens Dam, Yasar Onel, Yi-Ming Zhong, B. Curé, A. A. Kolomiets, A. M. Valente-Feliciano, Laurette Ponce, David Olivier Jamin, P. Krkotic, Alexandre Louzguiti, Marina Putti, Holger Podlech, Petr Volkov, M. Angelucci, F. Duval, I. Hiekkanen, W. M. Yao, Giancarlo Ferrera, C. Lorin, Y. Dydyshka, Kurt R. Peters, Gergely Gabor Barnafoldi, V. Vysotsky, V. Arı, E. Pilicer, M. Chamizo-Llatas, G. Kuhlmann, Hans Quack, R. Valizadeh, Tiina Salmi, Thomas Kramer, Adam Jeff, A. Abada, J. M. Duval, J. Abelleira Fernandez, A. Leveratto, E. Tal Hod, X. Wu, Laurent Serin, Sarah Aull, Samuele Mariotto, A. Poiron, Sabine Riemann, P. Selva, V. I. Pantsyrny, Gianluca Valentino, K. Kahle, S. Aune, K. Potamianos, Eros Cazzato, M. Giovannetti, Petr Mandrik, S. Sidorov, F. 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Gobbi, Michael Hance, A. J. Barr, V. Del Duca, V. Guzey, M. Pont, Michele Selvaggi, Oliver Brüning, J. Barreiro Guimarães da Costa, A. Drago, Y. Zhang, Giovanni Punzi, Viktor Matveev, Anadi Canepa, Clemens Lange, B. L. Militsyn, Martijn Mulders, Max Klein, V. D’Auria, M. Mylona, Valeria Braccini, S. DasBakshi, David Calvet, Sophia Borowka, David Marzocca, S. Jadach, A. A. Pankov, Christophe Ochando, A. A. Tudora, I. Masina, Jure Zupan, A. Preinerstorfer, Benjamin Fuks, H. K. Soltveit, G. Rolando, E.E. Perepelkin, T. G. Rizzo, Saleh Sultansoy, Federico Roncarolo, K. Elsener, R. Q. Pan, P. Zhuang, David Attié, Jac Perez, K. Kravalis, F. Anulli, V. Ruhlmann-Kleider, S. Malvezzi, Steffen A. Bass, E. La Francesca, Heinz Pernegger, K. Grzanka, M. T. Tiirakari, Alberto Ventura, Alessandro Cerri, Marco Peruzzi, Eric Montesinos, O. Etisken, F. Grancagnolo, S. Kartal, H. Humer, Oliver Fischer, M. Primavera, Marco Toliman Lucchini, P. Vedrine, Felix Kling, M. Altınlı, Sergio Calatroni, C. Han, Olivier Leroy, R. T. D’Agnolo, N. Klinkenberg, A. Audurier, Tatsushi Nakamoto, Ali Bozbey, Bernd A. Kniehl, Carl J. Debono, I. P. J. Shipsey, Gregorio Bernardi, Paolo Nason, William James Fawcett, J. M. Jiménez, D. Denisov, M. Serluca, David Curtin, Arif Akhundov, M. García Pérez, Iacopo Vivarelli, Emanuele Bacchiocchi, Markus Zerlauth, Julia Hrdinka, F. Butin, F. Müller, D. Tikhonov, Jorg Wenninger, A. Kilic, Fabrizio Ferro, J. Tanaka, S. A. Antipov, Miroslav Atanasov, S. Kuttimalai, A. Y. Starikov, F. R. Blánquez, S. V. Furuseth, G. Gaudio, L. Malgeri, J. Curti, B. Turbiarz, S. Li, A. Romanov, Costas G. Papadopoulos, Brennan Goddard, Frank Krauss, Lidija Zivkovic, Toms Torims, Michaela Lackner, D. A. Lyubimtsev, G. Borghello, J. F. Grosse-Oetringhaus, A. Bogomyagkov, H. Duran Yildiz, N. Foppiani, Arthur Schaffer, J. Zhou, D. Liberati, Vincenzo Guidi, Naeem A. Tahir, M. Besançon, Daniel Schoerling, Joe Incandela, Giacomo Polesello, O. Cakir, I. Ruehl, Ruggero Vaglio, Z. 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Zurita, J, Işık Üniversitesi, Mühendislik Fakültesi, İnşaat Mühendisliği Bölümü, Işık University, Faculty of Engineering, Department of Civil Engineering, Bayındır, Cihan, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones, Abada A., Abbrescia M., AbdusSalam S.S., Abdyukhanov I., Abelleira Fernandez J., Abramov A., Aburaia M., Acar A.O., Adzic P.R., Agrawal P., Aguilar-Saavedra J.A., Aguilera-Verdugo J.J., Aiba M., Aichinger I., Aielli G., Akay A., Akhundov A., Aksakal H., Albacete J.L., Albergo S., Alekou A., Aleksa M., Aleksan R., Alemany Fernandez R.M., Alexahin Y., Alia R.G., Alioli S., Alipour Tehrani N., Allanach B.C., Allport P.P., Altinli M., Altmannshofer W., Ambrosio G., Amorim D., Amstutz O., Anderlini L., Andreazza A., Andreini M., Andriatis A., Andris C., Andronic A., Angelucci M., Antinori F., Antipov S.A., Antonelli M., Antonello M., Antonioli P., Antusch S., Anulli F., Apolinario L., Apollinari G., Apollonio A., Appelo D., Appleby R.B., Apyan A., Arbey A., Arbuzov A., Arduini G., Ari V., Arias S., Armesto N., Arnaldi R., Arsenyev S.A., Arzeo M., Asai S., Aslanides E., Assmann R.W., Astapovych D., Atanasov M., Atieh S., Attie D., Auchmann B., Audurier A., Aull S., Aumon S., Aune S., Avino F., Avrillaud G., Aydin G., Azatov A., Azuelos G., Azzi P., Azzolini O., Azzurri P., Bacchetta N., Bacchiocchi E., Bachacou H., Baek Y.W., Baglin V., Bai Y., Baird S., Baker M.J., Baldwin M.J., Ball A.H., Ballarino A., Banerjee S., Barber D.P., Barducci D., Barjhoux P., Barna D., Barnafoldi G.G., Barnes M.J., Barr A., Barranco Garcia J., Barreiro Guimaraes da Costa J., Bartmann W., Baryshevsky V., Barzi E., Bass S.A., Bastianin A., Baudouy B., Bauer F., Bauer M., Baumgartner T., Bautista-Guzman I., Bayindir C., Beaudette F., Bedeschi F., Beguin M., Bellafont I., Bellagamba L., Bellegarde N., Belli E., Bellingeri E., Bellini F., Bellomo G., Belomestnykh S., Bencivenni G., Benedikt M., Bernardi G., Bernardi J., Bernet C., Bernhardt J.M., Bernini C., Berriaud C., Bertarelli A., Bertolucci S., Besana M.I., Besancon M., Beznosov O., Bhat P., Bhat C., Biagini M.E., Biarrotte J.-L., Bibet Chevalier A., Bielert E.R., Biglietti M., Bilei G.M., Bilki B., Biscari C., Bishara F., Blanco-Garcia O.R., Blanquez F.R., Blekman F., Blondel A., Blumlein J., Boccali T., Boels R., Bogacz S.A., Bogomyagkov A., Boine-Frankenheim O., Boland M.J., Bologna S., Bolukbasi O., Bomben M., Bondarenko S., Bonvini M., Boos E., Bordini B., Bordry F., Borghello G., Borgonovi L., Borowka S., Bortoletto D., Boscherini D., Boscolo M., Boselli S., Bosley R.R., Bossu F., Botta C., Bottura L., Boughezal R., Boutin D., Bovone G., Bozovic Jelisavic I., Bozbey A., Bozzi C., Bozzini D., Braccini V., Braibant-Giacomelli S., Bramante J., Braun-Munzinger P., Briffa J.A., Britzger D., Brodsky S.J., Brooke J.J., Bruce R., Bruckman De Renstrom P., Bruna E., Bruning O., Brunner O., Brunner K., Bruzzone P., Buffat X., Bulyak E., Burkart F., Burkhardt H., Burnet J.-P., Butin F., Buttazzo D., Butterworth A., Caccia M., Cai Y., Caiffi B., Cairo V., Cakir O., Calaga R., Calatroni S., Calderini G., Calderola G., Caliskan A., Calvet D., Calviani M., Camalich J.M., Camarri P., Campanelli M., Camporesi T., Canbay A.C., Canepa A., Cantergiani E., Cantore-Cavalli D., Capeans M., Cardarelli R., Cardella U., Cardini A., Carloni Calame C.M., Carra F., Carra S., Carvalho A., Casalbuoni S., Casas J., Cascella M., Castelnovo P., Castorina G., Catalano G., Cavasinni V., Cazzato E., Cennini E., Cerri A., Cerutti F., Cervantes J., Chaikovska I., Chakrabortty J., Chala M., Chamizo-Llatas M., Chanal H., Chanal D., Chance S., Chance A., Charitos P., Charles J., Charles T.K., Chattopadhyay S., Chehab R., Chekanov S.V., Chen N., Chernoded A., Chetvertkova V., Chevalier L., Chiarelli G., Chiarello G., Chiesa M., Chiggiato P., Childers J.T., Chmielinska A., Cholakian A., Chomaz P., Chorowski M., Chou W., Chrzaszcz M., Chyhyrynets E., Cibinetto G., Ciftci A.K., Ciftci R., Cimino R., Ciuchini M., Clark P.J., Coadou Y., Cobal M., Coccaro A., Cogan J., Cogneras E., Collamati F., Colldelram C., Collier P., Collot J., Contino R., Conventi F., Cook C.T.A., Cooley L., Corcella G., Cornell A.S., Corral G.H., Correia-Rodrigues H., Costanza F., Costa Pinto P., Couderc F., Coupard J., Craig N., Crespo Garrido I., Crivellin A., Croteau J.F., Crouch M., Cruz Alaniz E., Cure B., Curti J., Curtin D., Czech M., Dachauer C., D'Agnolo R.T., Daibo M., Dainese A., Dalena B., Daljevec A., Dallapiazza W., D'Aloia Schwartzentruber L., Dam M., D'Ambrosio G., Das S.P., DasBakshi S., da Silva W., da Silveira G.G., D'Auria V., D'Auria S., David A., Davidek T., Deandrea A., de Blas J., Debono C.J., De Curtis S., De Filippis N., de Florian D., Deghaye S., de Jong S.J., Del Bo C., Del Duca V., Delikaris D., Deliot F., Dell'Acqua A., Delle Rose L., Delmastro M., De Lucia E., Demarteau M., Denegri D., Deniau L., Denisov D., Denizli H., Denner A., d'Enterria D., de Rijk G., De Roeck A., Derue F., Deschamps O., Descotes-Genon S., Dev P.S.B., de Vivie de Regie J.B., Dewanjee R.K., Di Ciaccio A., Di Cicco A., Dillon B.M., Di Micco B., Di Nezza P., Di Vita S., Doblhammer A., Dominjon A., D'Onofrio M., Dordei F., Drago A., Draper P., Drasal Z., Drewes M., Duarte L., Dubovyk I., Duda P., Dudarev A., Dudko L., Duellmann D., Dunser M., du Pree T., Durante M., Duran Yildiz H., Dutta S., Duval F., Duval J.M., Dydyshka Y., Dziewit B., Eisenhardt S., Eisterer M., Ekelof T., El Khechen D., Ellis S.A., Ellis J., Ellison J.A., Elsener K., Elsing M., Enari Y., Englert C., Eriksson H., Eskola K.J., Esposito L.S., Etisken O., Etzion E., Fabbricatore P., Falkowski A., Falou A., Faltova J., Fan J., Fano L., Farilla A., Farinelli R., Farinon S., Faroughy D.A., Fartoukh S.D., Faus-Golfe A., Fawcett W.J., Felici G., Felsberger L., Ferdeghini C., Fernandez Navarro A.M., Fernandez-Tellez A., Ferradas Troitino J., Ferrara G., Ferrari R., Ferreira L., Ferreira da Silva P., Ferrera G., Ferro F., Fiascaris M., Fiorendi S., Fiorio C., Fischer O., Fischer E., Flieger W., Florio M., Fonnesu D., Fontanesi E., Foppiani N., Foraz K., Forkel-Wirth D., Forte S., Fouaidy M., Fournier D., Fowler T., Fox J., Francavilla P., Franceschini R., Franchino S., Franco E., Freitas A., Fuks B., Furukawa K., Furuseth S.V., Gabrielli E., Gaddi A., Galanti M., Gallo E., Ganjour S., Gao J., Garcia Diaz V., Garcia Perez M., Garcia Tabares L., Garion C., Garzelli M.V., Garzia I., Gascon-Shotkin S.M., Gaudio G., Gay P., Ge S.-F., Gehrmann T., Genest M.H., Gerard R., Gerigk F., Gerwig H., Giacomelli P., Giagu S., Gianfelice-Wendt E., Gianotti F., Giffoni F., Gilardoni S.S., Gil Costa M., Giovannetti M., Giovannozzi M., Giubellino P., Giudice G.F., Giunta A., Gladilin L.K., Glukhov S., Gluza J., Gobbi G., Goddard B., Goertz F., Golling T., Goncalves V.P., Goncalo R., Gonzalez Gomez L.A., Gorgi Zadeh S., Gorine G., Gorini E., Gourlay S.A., Gouskos L., Grancagnolo F., Grassellino A., Grau A., Graverini E., Gray H.M., Greco M., Grenard J.-L., Grimm O., Grojean C., Gromov V.A., Grosse-Oetringhaus J.F., Grudiev A., Grzanka K., Gu J., Guadagnoli D., Guidi V., Guiducci S., Guillermo Canton G., Gunaydin Y.O., Gupta R., Gupta R.S., Gutierrez J., Gutleber J., Guyot C., Guzey V., Gwenlan C., Haberstroh C., Hacisahinoglu B., Haerer B., Hahn K., Hahn T., Hammad A., Han C., Hance M., Hannah A., Harris P.C., Hati C., Haug S., Hauptman J., Haurylavets V., He H.-J., Hegglin A., Hegner B., Heinemann K., Heinemeyer S., Helsens C., Henriques A., Hernandez P., Hernandez-Pinto R.J., Hernandez-Sanchez J., Herzig T., Hiekkanen I., Hillert W., Hoehn T., Hofer M., Hofle W., Holdener F., Holleis S., Holzer B., Hong D.K., Honorato C.G., Hopkins S.C., Hrdinka J., Hug F., Humann B., Humer H., Hurth T., Hutton A., Iacobucci G., Ibarrola N., Iconomidou-Fayard L., Ilyina-Brunner K., Incandela J., Infantino A., Ippolito V., Ishino M., Islam R., Ita H., Ivanovs A., Iwamoto S., Iyer A., Izquierdo Bermudez S., Jadach S., Jamin D.O., Janot P., Jarry P., Jeff A., Jenny P., Jensen E., Jensen M., Jiang X., Jimenez J.M., Jones M.A., Jones O.R., Jowett J.M., Jung S., Kaabi W., Kado M., Kahle K., Kalinovskaya L., Kalinowski J., Kamenik J.F., Kannike K., Kara S.O., Karadeniz H., Karaventzas V., Karpov I., Kartal S., Karyukhin A., Kashikhin V., Katharina Behr J., Kaya U., Keintzel J., Keinz P.A., Keppel K., Kersevan R., Kershaw K., Khanpour H., Khatibi S., Khatiri Yanehsari M., Khoze V.V., Kieseler J., Kilic A., Kilpinen A., Kim Y.-K., Kim D.W., Klein U., Klein M., Kling F., Klinkenberg N., Kloppel S., Klute M., Klyukhin V.I., Knecht M., Kniehl B., Kocak F., Koeberl C., Kolano A.M., Kollegger A., Kolodziej K., Kolomiets A.A., Komppula J., Koop I., Koppenburg P., Koratzinos M., Kordiaczynska M., Korjik M., Kortner O., Kostka P., Kotlarski W., Kotnig C., Kottig T., Kotwal A.V., Kovalenko A.D., Kowalski S., Kozaczuk J., Kozlov G.A., Kozub S.S., Krainer A.M., Kramer T., Kramer M., Krammer M., Krasnov A.A., Krauss F., Kravalis K., Kretzschmar L., Kriske R.M., Kritscher H., Krkotic P., Kroha H., Kucharczyk M., Kuday S., Kuendig A., Kuhlmann G., Kulesza A., Kumar M., Kusina A., Kuttimalai S., Kuze M., Kwon T., Lackner F., Lackner M., La Francesca E., Laine M., Lamanna G., La Mendola S., Lancon E., Landsberg G., Langacker P., Lange C., Langner A., Lankford A.J., Lansberg J.P., Lari T., Laycock P.J., Lebrun P., Lechner A., Lee K., Lee S., Lee R., Lefevre T., Le Guen P., Lehtinen T., Leith S.B., Lenzi P., Leogrande E., Leonidopoulos C., Leon-Monzon I., Lerner G., Leroy O., Lesiak T., Levai P., Leveratto A., Levichev E., Li G., Li S., Li R., Liberati D., Liepe M., Lissauer D.A., Liu Z., Lobko A., Locci E., Logothetis Agaliotis E., Lombardo M.P., Long A.J., Lorin C., Losito R., Louzguiti A., Low I., Lucchesi D., Lucchini M.T., Luciani A., Lueckhof M., Lunt A.J.G., Luzum M., Lyubimtsev D.A., Maggiora M., Magnin N., Mahmoud M.A., Mahmoudi F., Maitre J., Makarenko V., Malagoli A., Malcles J., Malgeri L., Mallon P.J., Maltoni F., Malvezzi S., Malyshev O.B., Mancinelli G., Mandrik P., Manfrinetti P., Mangano M., Manil P., Mannelli M., Marchiori G., Marhauser F., Mariani V., Marinozzi V., Mariotto S., Marquard P., Marquet C., Marriott-Dodington T., Martin R., Martin O., Martin Camalich J., Martinez T., Martinez Bruzual H., Martinez-Hernandez M.I., Martins D.E., Marzani S., Marzocca D., Marzola L., Masciocchi S., Masina I., Massimiliano A., Massironi A., Masubuchi T., Matveev V.A., Mazzoni M.A., McCullough M., McIntosh P.A., Meade P., Medina L., Meier A., Meignan J., Mele B., Mendes Saraiva J.G., Menez F., Mentink M., Meoni E., Meridiani P., Merk M., Mermod P., Mertens V., Mether L., Metral E., Migliorati M., Milanese A., Milardi C., Milhano G., Militsyn B.L., Millet F., Minashvili I., Minervini J.V., Miralles L.S., Mirarchi D., Mishima S., Missiaen D.P., Mitselmakher G., Mitshuhashi T., Mnich J., Mohammadi Najafabadi M., Mohapatra R.N., Mokhov N., Molson J.G., Monge R., Montag C., Montagna G., Monteil S., Montenero G., Montesinos E., Moortgat F., Morange N., Morello G., Moreno Llacer M., Moretti M., Moretti S., Morley A.K., Moros A., Morozov I., Morretta V., Morrone M., Mostacci A., Muanza S., Muchnoi N., Muhlegger M., Mulder M., Mulders M., Muller B., Muller F., Muller A.-S., Munilla J., Murray M.J., Muttoni Y., Myers S., Mylona M., Nachtman J., Nakamoto T., Nardecchia M., Nardini G., Nason P., Nergiz Z., Nesterenko A.V., Netto J.A., Nettstrater A., Neubuser C., Neundorf J., Niccoli F., Nicrosini O., Nie Y., Niedermayer U., Niedziela J., Niemi A., Nikitin S.A., Nisati A., No J.M., Nonis M., Nosochkov Y., Novak M., Novokhatski A., O'Callaghan J.M., Ochando C., Ogur S., Ohmi K., Oide K., Okorokov V.A., Okumura Y., Oleari C., Olness F.I., Onel Y., Ortino M., Osborne J., Osland P., Otto T., Oyulmaz K.Y., Ozansoy A., Ozcan V., Ozdemir K., Pagliarone C.E., Pais da Silva H.F., Palmieri E., Palumbo L., Pampaloni A., Pan R.-Q., Panareo M., Panella O., Panico G., Panizzo G., Pankov A.A., Pantsyrny V., Papadopoulos C.G., Papaefstathiou A., Papaphilippou Y., Parker M.A., Parma V., Pasquali M., Patra S.K., Patterson R., Paukkunen H., Pauss F., Peggs S., Penttinen J.-P., Peon G., Perepelkin E.E., Perez E., Perez J.C., Perez G., Perez F., Perez Codina E., Perez Morales J., Perfilov M., Pernegger H., Peruzzi M., Pes C., Peters K., Petracca S., Petriello F., Pezzotti L., Pfeiffer S., Piccinini F., Pieloni T., Pierini M., Pikhartova H., Pikurs G., Pilicer E., Piminov P., Pira C., Pittau R., Placzek W., Plagge M., Plehn T., Pleier M.-A., Ploskon M., Podeur M., Podlech H., Podzorny T., Poggioli L., Poiron A., Polesello G., Poli Lener M., Polini A., Polinski J., Polozov S.M., Ponce L., Pont M., Pontecorvo L., Portaluri T., Potamianos K., Prasse C., Prausa M., Preinerstorfer A., Premat E., Price T., Primavera M., Prino F., Prioli M., Proudfoot J., Provino A., Pugnat T., Pukhaeva N., Pulawski S., Pulikowski D., Punzi G., Putti M., Pyarelal A., Quack H., Quispe M., Racioppi A., Rafique H., Raginel V., Raidal M., Ramirez-Uribe N.S., Ramsey-Musolf M.J., Rata R., Ratoff P., Ravotti F., Rebello Teles P., Reboud M., Redaelli S., Renner E., Renteria-Olivo A.E., Rescigno M., Reuter J., Ribon A., Ricci A.M., Riegler W., Riemann S., Riemann B., Riemann T., Rifflet J.M., Rimmer R.A., Rinaldesi R., Rinolfi L., Rios Rubiras O., Risselada T., Rivetti A., Rivkin L., Rizzo T., Robens T., Robert F., Robson A.J., Rochepault E., Roda C., Rodrigo G., Rodriguez-Cahuantzi M., Rogan C., Roig M., Rojas-Torres S., Rojo J., Rolandi G., Rolando G., Roloff P., Romanenko A., Romanov A., Roncarolo F., Rosado Sanchez A., Rosaz G., Rossi L., Rossi A., Rossmanith R., Rousset B., Royon C., Ruan X., Ruehl I., Ruhlmann-Kleider V., Ruiz R., Rumyantsev L., Ruprecht R., Ryazanov A.I., Saba A., Sadykov R., Saez de Jauregui D., Sahin M., Sailer B., Saito M., Sala F., Salam G.P., Salfeld-Nebgen J., Salgado C.A., Salini S., Sallese J.M., Salmi T., Salzburger A., Sampayo O.A., Sanfilippo S., Santiago J., Santopinto E., Santoro R., Sanz Ull A., Sarasola X., Sarpun I.H., Sauvain M., Savelyeva S., Sawada R., Sborlini G.F.R., Schaffer A., Schaumann M., Schenk M., Scheuerlein C., Schienbein I., Schlenga K., Schmickler H., Schmidt R., Schoerling D., Schoning A., Schorner-Sadenius T., Schott M., Schulte D., Schwaller P., Schwanenberger C., Schwemling P., Schwerg N., Scibile L., Sciuto A., Scomparin E., Sebastiani C., Seeber B., Segreti M., Selva P., Selvaggi M., Senatore C., Senol A., Serin L., Serluca M., Serra N., Seryi A., Sestini L., Sfyrla A., Shaposhnikov M., Shaposhnikova E., Sharkov B.Y., Shatilov D., Shelton J., Shiltsev V., Shipsey I.P., Shirkov G.D., Shivaji A., Shwartz D., Sian T., Sidorov S., Siemko A., Silvestrini L., Simand N., Simon F., Singh B.K., Siodmok A., Sirois Y., Sirtori E., Sirvinskaite R., Sitar B., Sjostrand T., Skands P., Skordis E., Skovpen K., Skrzypek M., Slade E., Slavich P., Slovak R., Smaluk V., Smirnov V., Snoeys W., Soffi L., Sollander P., Solovyanov O., Soltveit H.K., Song H., Sopicki P., Sorbi M., Spallino L., Spannowsky M., Spataro B., Sphicas P., Spiesberger H., Spiller P., Spira M., Srivastava T., Stachel J., Stakia A., Stanyard J.L., Starchenko E., Starikov A.Y., Stasto A.M., Statera M., Steerenberg R., Steggemann J., Stenvall A., Stivanello F., Stockinger D., Stoel L.S., Stoger-Pollach M., Strauss B., Stuart M., Stupakov G., Su S., Sublet A., Sugita K., Sulak L., Sullivan M.K., Sultansoy S., Sumida T., Suzuki K., Sylva G., Syphers M.J., Sznajder A., Taborelli M., Tahir N.A., Takeuchi M., Tal Hod E., Tambasco C., Tanaka J., Tang K., Tapan I., Taroni S., Tartarelli G.F., Tassielli G., Tavian L., Taylor T.M., Taylor G.N., Teixeira A.M., Tejeda-Munoz G., Telnov V.I., Tenchini R., ten Kate H.H.J., Terashi K., Tesi A., Testa M., Tetrel C., Teytelman D., Thaler J., Thamm A., Thomas S., Tiirakari M.T., Tikhomirov V., Tikhonov D., Timko H., Tisserand V., Tkachenko L.M., Tkaczuk J., Tock J.P., Todd B., Todesco E., Tomas Garcia R., Tommasini D., Tonelli G., Toral F., Torims T., Torre R., Townsend Z., Trant R., Treille D., Trentadue L., Tricoli A., Tricomi A., Trischuk W., Tropin I.S., Tuchming B., Tudora A.A., Turbiarz B., Turk Cakir I., Turri M., Tydecks T., Usovitsch J., Uythoven J., Vaglio R., Valassi A., Valchkova F., Valdivia Garcia M.A., Valente P., Valente R.U., Valente-Feliciano A.-M., Valentino G., Vale Silva L., Valet J.M., Valizadeh R., Valle J.W.F., Vallecorsa S., Vallone G., van Leeuwen M., van Rienen U.H., van Riesen-Haupt L., Varasteh M., Vecchi L., Vedrine P., Velev G., Veness R., Ventura A., Venturini Delsolaro W., Verducci M., Verhaaren C.B., Vernieri C., Verweij A.P., Verwilligen O., Viazlo O., Vicini A., Viehhauser G., Vignaroli N., Vignolo M., Vitrano A., Vivarelli I., Vlachos S., Vogel M., Vogt D.M., Volkl V., Volkov P., Volpini G., von Ahnen J., Vorotnikov G., Voutsinas G.G., Vysotsky V., Wagner U., Wallny R., Wang L.-T., Wang R., Wang K., Ward B.F.L., Watson T.P., Watson N.K., Ws Z., Weiland C., Weinzierl S., Welsch C.P., Wenninger J., Widorski M., Wiedemann U.A., Wienands H.-U., Wilkinson G., Williams P.H., Winter A., Wohlfahrt A., Wojton T., Wollmann D., Womersley J., Woog D., Wu X., Wulzer A., Yanehsari M.K., Yang G., Yang H.J., Yao W.-M., Yazgan E., Yermolchik V., Yilmaz A., Yoo H.-D., Yost S.A., You T., Young C., Yu T.-T., Yu F., Zaborowska A., Zadeh S.G., Zahnd M., Zanetti M., Zanotto L., Zawiejski L., Zeiler P., Zerlauth M., Zernov S.M., Zevi Dell Porta G., Zhang Z., Zhang Y., Zhang C., Zhang H., Zhao Z., Zhong Y.-M., Zhou J., Zhou D., Zhuang P., Zick G., Zimmermann F., Zinn-Justin J., Zivkovic L., Zlobin A.V., Zobov M., Zupan J., Zurita J., BAİBÜ, Fen Edebiyat Fakültesi, Fizik Bölümü, Denizli, Haluk, TOBB ETU, Faculty of Engineering, Department of Electrical & Electronics Engineering, TOBB ETU, Faculty of Engineering, Department of Material Science & Nanotechnology Engineering, TOBB ETÜ, Mühendislik Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü, TOBB ETÜ, Mühendislik Fakültesi, Malzeme Bilimi ve Nanoteknoloji Mühendisliği Bölümü, Bozbey, Ali, Sultansoy, Saleh, Özdemir, Kadri, Giresun Üniversitesi, UCL - SST/IRMP - Institut de recherche en mathématique et physique, and Ege Üniversitesi

Subjects
Beam losses, IMPACT, Physics::Instrumentation and Detectors, Physics beyond the Standard Model, EVENT BUILDER, hadron collider, General Physics and Astronomy, Mathematics and natural science: 400::Physics: 430::Nuclear and elementary particle physics: 431 [VDP], 01 natural sciences, 7. Clean energy, law.invention, Subatomär fysik, chemistry.chemical_compound, Conceptual design, Colliding beam accelerators, law, HE-LHC, Subatomic Physics, General Materials Science, Hadron colliders, Física::Física de partícules::Hadrons [Àrees temàtiques de la UPC], Large Hadron Collider, Acceleradors de partícules, Physics, Settore FIS/01 - Fisica Sperimentale, Beams (radiation), Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici, Upgrade, Impact, collimators, partikkelfysikk, Future Circular Collider, High-Energy, Systems engineering, HE-LHC: The High-Energy Large Hadron Collider, Col·lisionadors d'hadrons, Applied physics, Collimators, Socio-culturale, Fizik, Hadrons, Accelerator Physics and Instrumentation, HE-LHC physics, Condensed Matter::Materials Science, 0103 physical sciences, Physics::Atomic and Molecular Clusters, beam losses, ddc:530, High Energy Physics, partikkelakselerator, Physical and Theoretical Chemistry, Niobium-tin, 010306 general physics, Collider, Particle Physics, Beams (radiation) | Collimators | Beam losses, Energies::Energia nuclear [Àrees temàtiques de la UPC], Large Hadron Collider HE-LHC, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Colliders (Nuclear physics), Acceleratorfysik och instrumentering, Event builder, Accelerators and Storage Rings, Particle accelerators, chemistry, Experimental High Energy Physics, Physics::Accelerator Physics, High Energy Physics::Experiment, Future Colliders
Abstract

Authors: A. AbadaM. AbbresciaS. S. AbdusSalamI. AbdyukhanovJ. Abelleira FernandezA. AbramovM. AburaiaA. O. AcarP. R. AdzicP. AgrawalJ. A. Aguilar-SaavedraJ. J. Aguilera-VerdugoM. AibaI. AichingerG. AielliA. AkayA. AkhundovH. AksakalJ. L. AlbaceteS. AlbergoA. AlekouM. AleksaR. AleksanR. M. Alemany FernandezY. AlexahinR. G. AlíaS. AlioliN. Alipour TehraniB. C. AllanachP. P. AllportM. AltınlıW. AltmannshoferG. AmbrosioD. AmorimO. AmstutzL. AnderliniA. AndreazzaM. AndreiniA. AndriatisC. AndrisA. AndronicM. AngelucciF. AntinoriS. A. AntipovM. AntonelliM. AntonelloP. AntonioliS. AntuschF. AnulliL. ApolinárioG. ApollinariA. ApollonioD. AppelöR. B. ApplebyA. ApyanA. ApyanA. ArbeyA. ArbuzovG. ArduiniV. ArıS. AriasN. ArmestoR. ArnaldiS. A. ArsenyevM. ArzeoS. AsaiE. AslanidesR. W. AßmannD. AstapovychM. AtanasovS. AtiehD. AttiéB. AuchmannA. AudurierS. AullS. AumonS. AuneF. AvinoG. AvrillaudG. AydınA. AzatovG. AzuelosP. AzziO. AzzoliniP. AzzurriN. BacchettaE. BacchiocchiH. BachacouY. W. BaekV. BaglinY. BaiS. BairdM. J. BakerM. J. BaldwinA. H. BallA. BallarinoS. BanerjeeD. P. BarberD. BarducciP. BarjhouxD. BarnaG. G. BarnaföldiM. J. BarnesA. BarrJ. Barranco GarcíaJ. Barreiro Guimarães da CostaW. BartmannV. BaryshevskyE. BarziS. A. BassA. BastianinB. BaudouyF. BauerM. BauerT. BaumgartnerI. Bautista-GuzmánC. BayındırF. BeaudetteF. BedeschiM. BéguinI. BellafontL. BellagambaN. BellegardeE. BelliE. BellingeriF. BelliniG. BellomoS. BelomestnykhG. BencivenniM. BenediktG. BernardiJ. BernardiC. BernetJ. M. BernhardtC. BerniniC. BerriaudA. BertarelliS. BertolucciM. I. BesanaM. BesançonO. BeznosovP. BhatC. BhatM. E. BiaginiJ. -L. BiarrotteA. Bibet ChevalierE. R. BielertM. BigliettiG. M. BileiB. BilkiC. BiscariF. BisharaO. R. Blanco-GarcíaF. R. BlánquezF. BlekmanA. BlondelJ. BlümleinT. BoccaliR. BoelsS. A. BogaczA. BogomyagkovO. Boine-FrankenheimM. J. BolandS. BolognaO. BolukbasiM. BombenS. BondarenkoM. BonviniE. BoosB. BordiniF. BordryG. BorghelloL. BorgonoviS. BorowkaD. BortolettoD. BoscheriniM. BoscoloS. BoselliR. R. BosleyF. BossuC. BottaL. BotturaR. BoughezalD. BoutinG. BovoneI. Božović JelisavićA. BozbeyC. BozziD. BozziniV. BracciniS. Braibant-GiacomelliJ. BramanteP. Braun-MunzingerJ. A. BriffaD. BritzgerS. J. BrodskyJ. J. BrookeR. BruceP. Brückman De RenstromE. BrunaO. BrüningO. BrunnerK. BrunnerP. BruzzoneX. BuffatE. BulyakF. BurkartH. BurkhardtJ. -P. BurnetF. ButinD. ButtazzoA. ButterworthM. CacciaY. CaiB. CaiffiV. CairoO. CakirR. CalagaS. CalatroniG. CalderiniG. CalderolaA. CaliskanD. CalvetM. CalvianiJ. M. CamalichP. CamarriM. CampanelliT. CamporesiA. C. CanbayA. CanepaE. CantergianiD. Cantore-CavalliM. CapeansR. CardarelliU. CardellaA. CardiniC. M. Carloni CalameF. CarraS. CarraA. CarvalhoS. CasalbuoniJ. CasasM. CascellaP. CastelnovoG. CastorinaG. CatalanoV. CavasinniE. CazzatoE. CenniniA. CerriF. CeruttiJ. CervantesI. ChaikovskaJ. ChakraborttyM. ChalaM. Chamizo-LlatasH. ChanalD. ChanalS. ChanceA. ChancéP. CharitosJ. CharlesT. K. CharlesS. ChattopadhyayR. ChehabS. V. ChekanovN. ChenA. ChernodedV. ChetvertkovaL. ChevalierG. ChiarelliG. ChiarelloM. ChiesaP. ChiggiatoJ. T. ChildersA. ChmielińskaA. CholakianP. ChomazM. ChorowskiW. ChouM. ChrzaszczE. ChyhyrynetsG. CibinettoA. K. CiftciR. CiftciR. CiminoM. CiuchiniP. J. ClarkY. CoadouM. CobalA. CoccaroJ. CoganE. CognerasF. CollamatiC. ColldelramP. CollierJ. CollotR. ContinoF. ConventiC. T. A. CookL. CooleyG. CorcellaA. S. CornellG. H. CorralH. Correia-RodriguesF. CostanzaP. Costa PintoF. CoudercJ. CoupardN. CraigI. Crespo GarridoA. CrivellinJ. F. CroteauM. CrouchE. Cruz AlanizB. CuréJ. CurtiD. CurtinM. CzechC. DachauerR. T. D’AgnoloM. DaiboA. DaineseB. DalenaA. DaljevecW. DallapiazzaL. D’Aloia SchwartzentruberM. DamG. D’AmbrosioS. P. DasS. DasBakshiW. da SilvaG. G. da SilveiraV. D’AuriaS. D’AuriaA. DavidT. DavidekA. DeandreaJ. de BlasC. J. DebonoS. De CurtisN. De FilippisD. de FlorianS. DeghayeS. J. de JongC. Del BoV. Del DucaD. DelikarisF. DeliotA. Dell’AcquaL. Delle RoseM. DelmastroE. De LuciaM. DemarteauD. DenegriL. DeniauD. DenisovH. DenizliA. DennerD. d’EnterriaG. de RijkA. De RoeckF. DerueO. DeschampsS. Descotes-GenonP. S. B. DevJ. B. de Vivie de RégieR. K. DewanjeeA. Di CiaccioA. Di CiccoB. M. DillonB. Di MiccoP. Di NezzaS. Di VitaA. DoblhammerA. DominjonM. D’OnofrioF. DordeiA. DragoP. DraperZ. DrasalM. DrewesL. DuarteI. DubovykP. DudaA. DudarevL. DudkoD. DuellmannM. DünserT. du PreeM. DuranteH. Duran YildizS. DuttaF. DuvalJ. M. DuvalY. DydyshkaB. DziewitS. EisenhardtM. EistererT. EkelofD. El KhechenS. A. EllisJ. EllisJ. A. EllisonK. ElsenerM. ElsingY. EnariC. EnglertH. ErikssonK. J. EskolaL. S. EspositoO. EtiskenE. EtzionP. FabbricatoreA. FalkowskiA. FalouJ. FaltovaJ. FanL. FanòA. FarillaR. FarinelliS. FarinonD. A. FaroughyS. D. FartoukhA. Faus-GolfeW. J. FawcettG. FeliciL. FelsbergerC. FerdeghiniA. M. Fernandez NavarroA. Fernández-TéllezJ. Ferradas TroitinoG. FerraraR. FerrariL. FerreiraP. Ferreira da SilvaG. FerreraF. FerroM. FiascarisS. FiorendiC. FiorioO. FischerE. FischerW. FliegerM. FlorioD. FonnesuE. FontanesiN. FoppianiK. ForazD. Forkel-WirthS. ForteM. FouaidyD. FournierT. FowlerJ. FoxP. FrancavillaR. FranceschiniS. FranchinoE. FrancoA. FreitasB. FuksK. FurukawaS. V. FurusethE. GabrielliA. GaddiM. GalantiE. GalloS. GanjourJ. GaoJ. GaoV. Garcia DiazM. García PérezL. García TabarésC. GarionM. V. GarzelliI. GarziaS. M. Gascon-ShotkinG. GaudioP. GayS. -F. GeT. GehrmannM. H. GenestR. GerardF. GerigkH. GerwigP. GiacomelliS. GiaguE. Gianfelice-WendtF. GianottiF. GiffoniS. S. GilardoniM. Gil CostaM. GiovannettiM. GiovannozziP. GiubellinoG. F. GiudiceA. GiuntaL. K. GladilinS. GlukhovJ. GluzaG. GobbiB. GoddardF. GoertzT. GollingV. P. GoncalvesR. GonçaloL. A. Gonzalez GomezS. Gorgi ZadehG. GorineE. GoriniS. A. GourlayL. GouskosF. GrancagnoloA. GrassellinoA. GrauE. GraveriniH. M. GrayMa. GrecoMi. GrecoJ. -L. GrenardO. GrimmC. GrojeanV. A. GromovJ. F. Grosse-OetringhausA. GrudievK. GrzankaJ. GuD. GuadagnoliV. GuidiS. GuiducciG. Guillermo CantonY. O. GünaydinR. GuptaR. S. GuptaJ. GutierrezJ. GutleberC. GuyotV. GuzeyC. GwenlanC. HaberstrohB. HacışahinoğluB. HaererK. HahnT. HahnA. HammadC. HanM. HanceA. HannahP. C. HarrisC. HatiS. HaugJ. HauptmanV. HaurylavetsH. -J. HeA. HegglinB. HegnerK. HeinemannS. HeinemeyerC. HelsensA. HenriquesA. HenriquesP. HernandezR. J. Hernández-PintoJ. Hernandez-SanchezT. HerzigI. HiekkanenW. HillertT. HoehnM. HoferW. HöfleF. HoldenerS. HolleisB. HolzerD. K. HongC. G. HonoratoS. C. HopkinsJ. HrdinkaF. HugB. HumannH. HumerT. HurthA. HuttonG. IacobucciN. IbarrolaL. Iconomidou-FayardK. Ilyina-BrunnerJ. IncandelaA. InfantinoV. IppolitoM. IshinoR. IslamH. ItaA. IvanovsS. IwamotoA. IyerS. Izquierdo BermudezS. JadachD. O. JaminP. JanotP. JarryA. JeffP. JennyE. JensenM. JensenX. JiangJ. M. JiménezM. A. JonesO. R. JonesJ. M. JowettS. JungW. KaabiM. KadoK. KahleL. KalinovskayaJ. KalinowskiJ. F. KamenikK. KannikeS. O. KaraH. KaradenizV. KaraventzasI. KarpovS. KartalA. KaryukhinV. KashikhinJ. Katharina BehrU. KayaJ. KeintzelP. A. KeinzK. KeppelR. KersevanK. KershawH. KhanpourS. KhatibiM. Khatiri YanehsariV. V. KhozeJ. KieselerA. KilicA. KilpinenY. -K. KimD. W. KimU. KleinM. KleinF. KlingN. KlinkenbergS. KlöppelM. KluteV. I. KlyukhinM. KnechtB. KniehlF. KocakC. KoeberlA. M. KolanoA. KolleggerK. KołodziejA. A. KolomietsJ. KomppulaI. KoopP. KoppenburgM. KoratzinosM. KordiaczyńskaM. KorjikO. KortnerP. KostkaW. KotlarskiC. KotnigT. KöttigA. V. KotwalA. D. KovalenkoS. KowalskiJ. KozaczukG. A. KozlovS. S. KozubA. M. KrainerT. KramerM. KrämerM. KrammerA. A. KrasnovF. KraussK. KravalisL. KretzschmarR. M. KriskeH. KritscherP. KrkoticH. KrohaM. KucharczykS. KudayA. KuendigG. KuhlmannA. KuleszaM. KumarM. KumarA. KusinaS. KuttimalaiM. KuzeT. KwonF. LacknerM. LacknerE. La FrancescaM. LaineG. LamannaS. La MendolaE. LançonG. LandsbergP. LangackerC. LangeA. LangnerA. J. LankfordJ. P. LansbergT. LariP. J. LaycockP. LebrunA. LechnerK. LeeS. LeeR. LeeT. LefevreP. Le GuenT. LehtinenS. B. LeithP. LenziE. LeograndeC. LeonidopoulosI. Leon-MonzonG. LernerO. LeroyT. LesiakP. LévaiA. LeverattoE. LevichevG. LiS. LiR. LiD. LiberatiM. LiepeD. A. LissauerZ. LiuA. LobkoE. LocciE. Logothetis AgaliotisM. P. LombardoA. J. LongC. LorinR. LositoA. LouzguitiI. LowD. LucchesiM. T. LucchiniA. LucianiM. LueckhofA. J. G. LuntM. LuzumD. A. LyubimtsevM. MaggioraN. MagninM. A. MahmoudF. MahmoudiJ. MaitreV. MakarenkoA. MalagoliJ. MalclésL. MalgeriP. J. MallonF. MaltoniS. MalvezziO. B. MalyshevG. MancinelliP. MandrikP. ManfrinettiM. ManganoP. ManilM. MannelliG. MarchioriF. MarhauserV. MarianiV. MarinozziS. MariottoP. MarquardC. MarquetT. Marriott-DodingtonR. MartinO. MartinJ. Martin CamalichT. MartinezH. Martinez BruzualM. I. Martínez-HernándezD. E. MartinsS. MarzaniD. MarzoccaL. MarzolaS. MasciocchiI. MasinaA. MassimilianoA. MassironiT. MasubuchiV. A. MatveevM. A. MazzoniM. McCulloughP. A. McIntoshP. MeadeL. MedinaA. MeierJ. MeignanB. MeleJ. G. Mendes SaraivaF. MenezM. MentinkE. MeoniP. MeridianiM. MerkP. MermodV. MertensL. MetherE. MétralM. MiglioratiA. MilaneseC. MilardiG. MilhanoB. L. MilitsynF. MilletI. MinashviliJ. V. MinerviniL. S. MirallesD. MirarchiS. MishimaD. P. MissiaenG. MitselmakherT. MitshuhashiJ. MnichM. Mohammadi NajafabadiR. N. MohapatraN. MokhovJ. G. MolsonR. MongeC. MontagG. MontagnaS. MonteilG. MonteneroE. MontesinosF. MoortgatN. MorangeG. MorelloM. Moreno LlácerM. MorettiS. MorettiA. K. MorleyA. MorosI. MorozovV. MorrettaM. MorroneA. MostacciS. MuanzaN. MuchnoiM. MühleggerM. MulderM. MuldersB. MüllerF. MüllerA. -S. MüllerJ. MunillaM. J. MurrayY. MuttoniS. MyersM. MylonaJ. NachtmanT. NakamotoM. NardecchiaG. NardiniP. NasonZ. NergizA. V. NesterenkoJ. A. NettoA. NettsträterC. NeubüserJ. NeundorfF. NiccoliO. NicrosiniY. NieU. NiedermayerJ. NiedzielaA. NiemiS. A. NikitinA. NisatiJ. M. NoM. NonisY. NosochkovM. NovákA. NovokhatskiJ. M. O’CallaghanC. OchandoS. OgurK. OhmiK. OideV. A. OkorokovY. OkumuraC. OleariF. I. OlnessY. OnelM. OrtinoJ. OsborneP. OslandT. OttoK. Y. OyulmazA. OzansoyV. ÖzcanK. ÖzdemirC. E. PagliaroneH. F. Pais da SilvaE. PalmieriL. PalumboA. PampaloniR. -Q. PanM. PanareoO. PanellaG. PanicoG. PanizzoA. A. PankovV. PantsyrnyC. G. PapadopoulosA. PapaefstathiouY. PapaphilippouM. A. ParkerV. ParmaM. PasqualiS. K. PatraR. PattersonH. PaukkunenF. PaussS. PeggsJ. -P. PenttinenG. PeónE. E. PerepelkinE. PerezJ. C. PerezG. PerezF. PérezE. Perez CodinaJ. Perez MoralesM. PerfilovH. PerneggerM. PeruzziC. PesK. PetersS. PetraccaF. PetrielloL. PezzottiS. PfeifferF. PiccininiT. PieloniM. PieriniH. PikhartovaG. PikursE. PilicerP. PiminovC. PiraR. PittauW. PłaczekM. PlaggeT. PlehnM. -A. PleierM. PłoskońM. PodeurH. PodlechT. PodzornyL. PoggioliA. PoironG. PoleselloM. Poli LenerA. PoliniJ. PolinskiS. M. PolozovL. PonceM. PontL. PontecorvoT. PortaluriK. PotamianosC. PrasseM. PrausaA. PreinerstorferE. PrematT. PriceM. PrimaveraF. PrinoM. PrioliJ. ProudfootA. ProvinoT. PugnatN. PukhaevaS. PuławskiD. PulikowskiG. PunziM. PuttiA. PyarelalH. QuackM. QuispeA. RacioppiH. RafiqueV. RaginelM. RaidalN. S. Ramírez-UribeM. J. Ramsey-MusolfR. RataP. RatoffF. RavottiP. Rebello TelesM. ReboudS. RedaelliE. RennerA. E. Rentería-OlivoM. RescignoJ. ReuterA. RibonA. M. RicciW. RieglerS. RiemannB. RiemannT. RiemannJ. M. RiffletR. A. RimmerR. RinaldesiL. RinolfiO. Rios RubirasT. RisseladaA. RivettiL. RivkinT. RizzoT. RobensF. RobertA. J. RobsonE. RochepaultC. RodaG. RodrigoM. Rodríguez-CahuantziC. RoganM. RoigS. Rojas-TorresJ. RojoG. RolandiG. RolandoP. RoloffA. RomanenkoA. RomanovF. RoncaroloA. Rosado SanchezG. RosazL. RossiA. RossiR. RossmanithB. RoussetC. RoyonX. RuanI. RuehlV. Ruhlmann-KleiderR. RuizL. RumyantsevR. RuprechtA. I. RyazanovA. SabaR. SadykovD. Saez de JaureguiM. SahinB. SailerM. SaitoF. SalaG. P. SalamJ. Salfeld-NebgenC. A. SalgadoS. SaliniJ. M. SalleseT. SalmiA. SalzburgerO. A. SampayoS. SanfilippoJ. SantiagoE. SantopintoR. SantoroA. Sanz UllX. SarasolaI. H. SarpünM. SauvainS. SavelyevaR. SawadaG. F. R. SborliniA. SchafferM. SchaumannM. SchenkC. ScheuerleinI. SchienbeinK. SchlengaH. SchmicklerR. SchmidtD. SchoerlingA. SchoningT. Schörner-SadeniusM. SchottD. SchulteP. SchwallerC. SchwanenbergerP. SchwemlingN. SchwergL. ScibileA. SciutoE. ScomparinC. SebastianiB. SeeberM. SegretiP. SelvaM. SelvaggiC. SenatoreA. SenolL. SerinM. SerlucaN. SerraA. SeryiL. SestiniA. SfyrlaM. ShaposhnikovE. ShaposhnikovaB. Y. SharkovD. ShatilovJ. SheltonV. ShiltsevI. P. ShipseyG. D. ShirkovA. ShivajiD. ShwartzT. SianS. SidorovA. SiemkoL. SilvestriniN. SimandF. SimonB. K. SinghA. SiódmokY. SiroisE. SirtoriR. SirvinskaiteB. SitarT. SjöstrandP. SkandsE. SkordisK. SkovpenM. SkrzypekE. SladeP. SlavichR. SlovakV. SmalukV. SmirnovW. SnoeysL. SoffiP. SollanderO. SolovyanovH. K. SoltveitH. SongP. SopickiM. SorbiL. SpallinoM. SpannowskyB. SpataroP. SphicasH. SpiesbergerP. SpillerM. SpiraT. SrivastavaJ. StachelA. StakiaJ. L. StanyardE. StarchenkoA. Y. StarikovA. M. StaśtoM. StateraR. SteerenbergJ. SteggemannA. StenvallF. StivanelloD. StöckingerL. S. StoelM. Stöger-PollachB. StraussM. StuartG. StupakovS. SuA. SubletK. SugitaL. SulakM. K. SullivanS. SultansoyT. SumidaK. SuzukiG. SylvaM. J. SyphersA. SznajderM. TaborelliN. A. TahirM. TakeuchiE. Tal HodC. TambascoJ. TanakaK. TangI. TapanS. TaroniG. F. TartarelliG. TassielliL. TavianT. M. TaylorG. N. TaylorA. M. TeixeiraG. Tejeda-MuñozV. I. TelnovR. TenchiniH. H. J. ten KateK. TerashiA. TesiM. TestaC. TetrelD. TeytelmanJ. ThalerA. ThammS. ThomasM. T. TiirakariV. TikhomirovD. TikhonovH. TimkoV. TisserandL. M. TkachenkoJ. TkaczukJ. P. TockB. ToddE. TodescoR. Tomás GarciaD. TommasiniG. TonelliF. ToralT. TorimsR. TorreZ. TownsendR. TrantD. TreilleL. TrentadueA. TricoliA. TricomiW. TrischukI. S. TropinB. TuchmingA. A. TudoraB. TurbiarzI. Turk CakirM. TurriT. TydecksJ. UsovitschJ. UythovenR. VaglioA. ValassiF. ValchkovaM. A. Valdivia GarciaP. ValenteR. U. ValenteA. -M. Valente-FelicianoG. ValentinoL. Vale SilvaJ. M. ValetR. ValizadehJ. W. F. ValleS. VallecorsaG. ValloneM. van LeeuwenU. H. van RienenL. van Riesen-HauptM. VarastehL. VecchiP. VedrineG. VelevR. VenessA. VenturaW. Venturini DelsolaroM. VerducciC. B. VerhaarenC. VernieriA. P. VerweijO. VerwilligenO. ViazloA. ViciniG. ViehhauserN. VignaroliM. VignoloA. VitranoI. VivarelliS. VlachosM. VogelD. M. VogtV. VölklP. VolkovG. VolpiniJ. von AhnenG. VorotnikovG. G. VoutsinasV. VysotskyU. WagnerR. WallnyL. -T. WangR. WangK. WangB. F. L. WardT. P. WatsonN. K. WatsonZ. WsC. WeilandS. WeinzierlC. P. WelschJ. WenningerM. WidorskiU. A. WiedemannH. -U. WienandsG. WilkinsonP. H. WilliamsA. WinterA. WohlfahrtT. WojtońD. WollmannJ. WomersleyD. WoogX. WuA. WulzerM. K. YanehsariG. YangH. J. YangW. -M. YaoE. YazganV. YermolchikA. YilmazA. YilmazH. -D. YooS. A. YostT. YouC. YoungT. -T. YuF. YuA. ZaborowskaS. G. ZadehM. ZahndM. ZanettiL. ZanottoL. ZawiejskiP. ZeilerM. ZerlauthS. M. ZernovG. Zevi Dell PortaZ. ZhangY. ZhangC. ZhangH. ZhangZ. ZhaoY. -M. ZhongJ. ZhouD. ZhouP. ZhuangG. ZickF. ZimmermannEmail authorJ. Zinn-JustinL. ZivkovicA. V. ZlobinM. ZobovJ. ZupanJ. Zuritathe FCC Collaboration, In response to the 2013 Update of the European Strategy for Particle Physics (EPPSU), the Future Circular Collider (FCC) study was launched as a world-wide international collaboration hosted by CERN. The FCC study covered an energy-frontier hadron collider (FCC-hh), a highest-luminosity high-energy lepton collider (FCC-ee), the corresponding 100km tunnel infrastructure, as well as the physics opportunities of these two colliders, and a high-energy LHC, based on FCC-hh technology. This document constitutes the fourth volume of the FCC Conceptual Design Report, devoted to the High-Energy Large Hadron Collider HE-LHC. It summarizes the HE-LHC physics discovery opportunities, presents the HE-LHC accelerator design, performance reach, and operation plan, discusses the underlying technologies, the civil engineering and technical infrastructure, and also sketches a possible implementation. Combining ingredients from the Large Hadron Collider (LHC), the high-luminosity LHC upgrade and adding novel technologies and approaches, the HE-LHC design aims at a hadron collider with about twice the centre-of-mass collision energy that the LHC can reach. Its performance aims at exploring physics beyond the Standard Model, signi cantly extending the LHC's direct and indirect sensitivity to new physics and discoveries.

Published
2020

10. The role of texturing and thickness of oxide buffer layers in the superconducting properties of Fe(Se,Te) Coated Conductors

Author

Antonella Mancini, Carlo Ferdeghini, Alessia Provino, Nicola Manca, M. Lisitskiy, Giulia Sylva, Andrea Malagoli, Mario Putti, Angelo Vannozzi, G. Celentano, Pietro Manfrinetti, Valeria Braccini, Emilio Bellingeri, I. Pallecchi, A. Leveratto, C. Bernini, Sylva, G., Bellingeri, E., Bernini, C., Celentano, G., Ferdeghini, C., Leveratto, A., Lisitskiy, M., Malagoli, A., Manca, N., Mancini, A., Manfrinetti, P., Pallecchi, I., Provino, A., Putti, M., Vannozzi, A., and Braccini, V.

Subjects
Superconductivity, Materials science, Condensed matter physics, Transition temperature, Fe(Se, RABiTS, Metals and Alloys, Oxide, chemistry.chemical_element, Hastelloy, Te), Condensed Matter Physics, Nickel, chemistry.chemical_compound, chemistry, Buffer Layers, Coated Conductors, Materials Chemistry, Ceramics and Composites, Electrical and Electronic Engineering, Thin film, Electric current, Current density, Electrical conductor
Abstract

In this paper the roles of texturing and thickness of different buffer layers employed in the fabrication of Fe(Se,Te) coated conductors are studied. Fe(Se,Te) thin films were deposited either on rolling assisted biaxially textured substrates substrates with highly textured CeO2 buffer layer and on HASTELLOY® C276 substrates with a randomly oriented native oxide grown through different oxidizing processes. It was found that the buffer layer has to be both thick enough to block Ni interdiffusion from the metallic tape to the Fe(Se,Te) overlayer, and textured enough to ensure good in-plane alignment of the superconducting film, and consequently good critical current densities (Jc). The best results in terms of critical temperature (Tc) and critical current were obtained using a highly textured 350 nm thick CeO2 buffer layer, but a fairly good Jc of 1.2 104 A cm−2 in self field at 5 K was also obtained using an HASTELLOY® C276 substrate with a 400 nm thick randomly oriented native oxide. The obtained results indicate that the superconducting properties of the Fe(Se,Te) coated conductors are determined by a trade-off between degree of texturing of the substrate and inhibition of Nickel interdiffusion.

Published
2020

11. Microwave properties of Fe(Se,Te) thin films in a magnetic field: Pinning and flux flow

Author

Giulia Sylva, Andrea Alimenti, Kostiantyn Torokhtii, Nicola Pompeo, Valeria Braccini, Enrico Silva, Edward Romans, Pompeo, N., Alimenti, A., Torokhtii, K., Sylva, G., Braccini, V., and Silva, E.

Subjects
History, Range (particle radiation), Materials science, Condensed matter physics, Computer Science Applications, Education, Magnetic field, Vortex, Electrical resistivity and conductivity, Condensed Matter::Superconductivity, Flux flow, Quasiparticle, Thin film, Microwave
Abstract

We present here a microwave (16 GHz) investigation of the complex surface impedance in a dc magnetic field (up to 1 T) of Fe(Se,Te) thin ( 300 nm) films. We derive the vortex parameters: the flux-flow resistivity yields information on the dynamics of the quasiparticles, the Labusch parameter yields a measure of the steepness of the pinning potential wells, and the depinning frequency assesses the frequency range where the material is suitable for high-frequency applications in a dc magnetic field. We compare the results to the data obtained in YBCO, Nb and Nb3Sn.

Published
2020

12. Pinning properties of FeSeTe thin film through multifrequency measurements of the surface impedance

Author

Kostiantyn Torokhtii, Andrea Alimenti, Enrico Silva, Nicola Pompeo, Giulia Sylva, Valeria Braccini, Pompeo, N, Torokhtii, K, Alimenti, A, Sylva, G, Braccini, V, and Silva, E

Subjects
010302 applied physics, Materials science, Condensed matter physics, Transition temperature, Condensed Matter - Superconductivity, Metals and Alloys, FOS: Physical sciences, Substrate (electronics), Dielectric resonator, Vorticity, Condensed Matter Physics, 01 natural sciences, Vortex, Superconductivity (cond-mat.supr-con), Resonator, Condensed Matter::Superconductivity, 0103 physical sciences, Materials Chemistry, Ceramics and Composites, Electrical and Electronic Engineering, Thin film, 010306 general physics, Microwave
Abstract

We present high frequency measurements of the vortex dynamics of a FeSe$_x$Te$_{1-x}$ ($x=0.5$) thin film grown on a CaF$_2$ substrate and with a critical temperature $T_c\simeq18\;$K, performed by means of a dual frequency dielectric resonator at 16.4 GHz and 26.6 GHz. We extract and discuss various important vortex parameters related to the pinning properties of the sample, such as the characteristic frequency $\nu_c$, the pinning constant $k_p$ and the pinning barrier height $U$ relevant for creep phenomena. We find that the vortex system is in the single-vortex regime, and that pinning attains relatively high values in terms of $k_p$, indicating significant pinning at the high frequencies here studied. The pinning barrier energy $U$ is quite small and exhibits a non-monotonous temperature dependence with a maximum near 12 K. This result is discussed in terms of core pinning of small portion of vortices of size $\propto\xi^3$ jumping out of the pinning wells over very small distances, a process which is favoured in the high frequency, short ranged vortex oscillations here explored., Comment: 18 pages, 7 figures

Published
2020

13. Epitaxial Zr-doped CeO2films by chemical solution deposition as buffer layers for Fe(Se,Te) film growth

Author

Achille Angrisani Armenio, Laura Piperno, Francesco Rizzo, Antonella Mancini, Valeria Braccini, Giuseppe Celentano, Angelo Vannozzi, Alessandro Rufoloni, Andrea Augieri, Giulia Sylva, Simone Prili, Andrea Masi, Marina Putti, Valentina Pinto, Enrico Silva, Pietro Manfrinetti, Vannozzi, A., Prili, S., Sylva, G., Masi, A., Armenio, A. A., Mancini, A., Pinto, V., Rufoloni, A., Piperno, L., Augieri, A., Rizzo, F., Manfrinetti, P., Braccini, V., Putti, M., Silva, E., and Celentano, G.

Subjects
Aluminium oxides, Materials science, epitaxial growth, Doping, iron based superconductors, chemical solution deposition, dewetting, magnetic characterization, Metals and Alloys, Surface finish, Condensed Matter Physics, Epitaxy, iron based superconductor, Surface coating, Chemical engineering, Materials Chemistry, Ceramics and Composites, Irradiation, Dewetting, Electrical and Electronic Engineering, Deposition (chemistry)
Abstract

The epitaxial growth of Zr-doped CeO2 (CZO) films by chemical solution deposition (CSD) on single crystal substrates such as Al2O3, SrTiO3 and Y2O3-stabilized ZrO2 (YSZ) and their use as buffer layers for Fe(Se,Te) film growth are reported. The growth of 30 nm thin CZO films is mostly dominated by dewetting issues, leading to highly incomplete substrate coverage due to the strong tendency of CZO grains to agglomerate. This effect is less severe on YSZ substrate and, in addition, can be fully controlled by setting the deposition temperature at 950 °C and operating under Ar-H2 reducing atmosphere. These conditions promote the growth of epitaxial and compact CZO films on YSZ, showing a flat surface morphology with root-mean-square roughness around 2.5 nm. Preliminary results on Fe(Se,Te) film deposited by pulsed laser deposition on CZO-buffered YSZ are reported. Although good epitaxial growth is achieved on CZO buffer layer, Fe(Se,Te) films exhibit poor superconducting properties. On the other hand, Fe(Se,Te) films show excellent properties when a seed layer is used, exhibiting a sharp superconducting transition at about 17 K and a critical current density exceeding 1 MA cm-2 at 4.2 K in self field. The main role of the seed layer, consisting of a non-superconducting Fe(Se,Te) film, is to favour the crystal and chemical matching between buffer layer and film, allowing for the growth of high-quality superconducting Fe(Se,Te) at deposition temperature as low as 200 °C. In perspective of applications, this result is a significant step towards process simplification and cost reduction of Fe(Se,Te)-based coated conductor technology development, being the first demonstration of superconducting Fe(Se,Te) films grown on CSD buffer layer.

Published
2020

14. Anisotropy Effects on the Quenching Current of Fe(Se,Te) Thin Films

Author

Carlo Ferdeghini, Sandro Pace, Armando Galluzzi, Massimiliano Polichetti, Gaia Grimaldi, Valeria Braccini, Angela Nigro, Antonio Leo, and Emilio Bellingeri

Subjects
Quenching, Materials science, Condensed matter physics, Critical current and flux pinning, Quanching current, anisotropy, 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Electronic, Optical and Magnetic Materials, angular dependence, iron chalcogenide wires, 0103 physical sciences, Angular dependence, Electrical and Electronic Engineering, Current (fluid), Thin film, superconducting materials, 010306 general physics, 0210 nano-technology, Anisotropy
Published
2018

15. Properties of Fe(Se, Te) Bicrystal Grain Boundary Junctions, SQUIDs, and Nanostrips

Author

Emanuele Enrico, Valeria Braccini, Carlo Ferdeghini, Emilio Bellingeri, Ciro Nappi, Ettore Sarnelli, Carlo Camerlingo, A. Leveratto, and S. Kawale

Subjects
Superconductivity, Josephson effect, Fabrication, Materials science, Misorientation, Condensed matter physics, 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Electronic, Optical and Magnetic Materials, 0103 physical sciences, Quantum interference, Grain boundary, Electrical and Electronic Engineering, Thin film, 010306 general physics, 0210 nano-technology
Abstract

We have fabricated and characterized single junctions, dc Superconducting Quantum Interference Devices (SQUIDs), and nanostrips made by Fe(Te, Se) superconductive thin films. SrTiO 3 bicrystal substrates with different misorientation angles have been used for the fabrication of Josephson junctions and SQUIDs. Nanostrips have been realized growing thin films on CaF 2 substrates. The interaction between fluxons and antifluxons has been taken into account for the evaluation of the pinning energy values.

Published
2017

16. Anisotropic Effect of Proton Irradiation on Pinning Properties of Fe(Se,Te) Thin Films

Author

Luca Pellegrino, Laura Gozzelino, Angela Nigro, Emilio Bellingeri, Carlo Ferdeghini, Sandro Pace, Giulia Sylva, Alberto Martinelli, Marina Putti, Gaia Grimaldi, Ilaria Pallecchi, Daniele Torsello, Gianluca Ghigo, Antonio Leo, and Valeria Braccini

Subjects
Superconducting materials radiation effects, iron chalcogenide wires, critical temperature and critical fields, resistance measurement, Materials science, Proton, Magnetoresistance, 01 natural sciences, critical temperature and critical fields, Condensed Matter::Superconductivity, 0103 physical sciences, Electronic, Cuprate, Irradiation, Optical and Magnetic Materials, Thin film, Electrical and Electronic Engineering, 010306 general physics, Anisotropy, Critical field, Superconductivity, iron chalcogenide wires, resistance measurement, Superconducting materials radiation effects, Electronic, Optical and Magnetic Materials, Condensed Matter Physics, Condensed matter physics
Abstract

At the present day, iron-based superconductors (IBS) can be considered as competitors of cuprates for the fabrication of superconducting cables for high field application in the presence of particle irradiation. In particular, it has been demonstrated that 11-IBS are very robust against proton irradiation. In this paper, we analyze the effect of this kind of irradiation on the anisotropy of superconducting and pinning properties of Fe(Se,Te) thin films grown on CaF2. By electrical transport measurements, we evaluate the upper critical field as a function of the temperature and the pinning activation energy as function of the applied magnetic field, for different orientation between the material crystal structure and the field itself, in pristine and irradiated samples. The aim is to recognize if and how proton irradiation modifies the anisotropy of the material properties.

Published
2019

17. Analysis of Fe(Se,Te) films deposited on unbuffered invar 36

Author

Valeria Braccini, Carlo Ferdeghini, Giulia Sylva, Giuseppe Celentano, Andrea Malagoli, Amalia Ballarino, Emilio Bellingeri, Alexander J.G. Lunt, Marina Putti, Angelo Vannozzi, Simon C. Hopkins, Sylva, G., Malagoli, A., Bellingeri, E., Putti, M., Ferdeghini, C., Vannozzi, A., Celentano, G., Hopkins, S. C., Lunt, A., Ballarino, A., and Braccini, V.

Subjects
Materials science, Misorientation, Te) thin films, Iron, Fe(Se, Analytical chemistry, Iron based superconductors, Substrate (electronics), engineering.material, Epitaxy, Heat treatment, 01 natural sciences, Microanalysis, Pulsed laser deposition, Nickel, Iron based superconductor, 0103 physical sciences, Electronic, Epitaxial growth, Texture (crystalline), Optical and Magnetic Materials, Electrical and Electronic Engineering, 010306 general physics, biaxial texturing, pulsed laser deposition, coated conductor, Substrates, invar 36 alloy, coated conductors, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Fe(Se,Te) thin films, Fe(Se,Te) thin film, engineering, Layer (electronics), Invar
Abstract

In this paper, the feasibility of producing Fe(Se,Te)-coated conductors on cost-effective, unbuffered Invar 36 substrates is studied. A suitable substrate with a sharp {001} texture and a misorientation angle lower than 10° was developed, and the possibility of growing epitaxial thin films without any buffer layer was demonstrated. It was also shown that the presence of a Fe(Se,Te) seed layer can improve the in- and out-of-plane orientation of the film. A high-resolution scanning electron microscopy study was performed, and the absence of a superconducting transition has been attributed to Ni poisoning based on X-ray microanalysis.

Published
2019

18. Measurements of Magnetic Field and Temperature Dependence of the Critical Current in Bi-2212 Superconducting Wires

Author

Vittoria Zunino, Carlo Ferdeghini, Valeria Braccini, Ilaria Pallecchi, Andrea Malagoli, and A. Leveratto

Subjects
Superconductivity, Materials science, Condensed matter physics, 02 engineering and technology, Superconducting magnetic energy storage, Cryocooler, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Measure (mathematics), Electronic, Optical and Magnetic Materials, Magnetic field, 0103 physical sciences, Critical current, Electrical and Electronic Engineering, 010306 general physics, 0210 nano-technology, Scaling
Abstract

In this paper, we describe our built in-house system for the measurement of the critical current density J c in superconductors. The setup is able to tolerate currents up to 800 A, and works in fields up to 7 T and temperatures from 4.2 to 40 K. The peculiarity of our system lies in its versatility: we can measure a high variety of superconducting samples up to 15 cm in length, testing their performance also at temperatures achievable by cryocoolers. Magnetic field and temperature dependencies of critical current density J c (H, T) are measured in Bi-2212 round wires. Bi-2212 wires are fabricated by applying the new GDG (grooverolling/drawing/groove-rolling) process consisting of the alternation of groove-rolling and drawing techniques, which densifies the filaments already during the working procedure prior to the heat treatment. A J c ≈ 4 × 10 5 A/cm 2 in self-field at 4.2 K is measured and a J c scaling based on the collective pinning theory is shown to hold above 2 T.

Published
2017

19. Critical current anisotropy in Fe(Se,Te) films irradiated by 3.5 MeV protons

Author

Laura Gozzelino, Daniele Torsello, Giulia Sylva, Angela Nigro, Gianluca Ghigo, Valeria Braccini, Carlo Ferdeghini, Gaia Grimaldi, Antonio Leo, and M. Putti

Subjects
Superconductivity, History, Materials science, Proton, Condensed matter physics, ion irradiation, Activation energy, Computer Science Applications, Education, Magnetic field, Superconductivity, ion irradiation, critical current, Irradiation, Thin film, Anisotropy, critical current, Pinning force
Abstract

Irradiation effects are often used to improve the effective pinning in superconductors, but sometimes they can reveal detrimental for superconducting properties. Fe(Se,Te) has been proven to be a very robust material against irradiation, in particular proton irradiation, thus configuring as an ideal material to work in harsh environments such as particle accelerators or fusion reactors. Anyway, the study of the pinning activation energy in Fe(Se,Te) thin film irradiated by 3.5 MeV protons suggests that this treatment can modify the anisotropy of the films pinning. Thus here we present the result of further investigation analyzing the effect of proton irradiation on the critical current and the pinning force both for the magnetic field applied parallel and perpendicular to the sample surface. We find that, although a slight effect on the critical current anisotropy is observed, the pinning landscape is not affected by the irradiation process. This confirms that Fe(Se,Te) can be considered for devices working in harsh environments.

Published
2020

20. Angular dependence of vortex instability in a layered superconductor: the case study of Fe(Se,Te) material

Author

Sandro Pace, E. Bellingeri, Valeria Braccini, Gaia Grimaldi, Antonio Leo, Angela Nigro, and C. Ferdeghini

Subjects
Flux pinning, Materials science, lcsh:Medicine, FOS: Physical sciences, 02 engineering and technology, 01 natural sciences, Instability, Article, Superconductivity (cond-mat.supr-con), Condensed Matter::Superconductivity, 0103 physical sciences, Cuprate, lcsh:Science, 010306 general physics, Anisotropy, Superconductivity, Multidisciplinary, Condensed matter physics, Condensed Matter - Superconductivity, lcsh:R, Vorticity, 021001 nanoscience & nanotechnology, Vortex, Magnetic field, lcsh:Q, 0210 nano-technology
Abstract

Anisotropy effects on flux pinning and flux flow are strongly effective in cuprate as well as iron-based superconductors due to their intrinsically layered crystallographic structure. However Fe(Se,Te) thin films grown on CaF2 substrate result less anisotropic with respect to all the other iron based superconductors. We present the first study on the angular dependence of the flux flow instability, which occurs in the flux flow regime as a current driven transition to the normal state at the instability point (I*, V*) in the current-voltage characteristics. The voltage jumps are systematically investigated as a function of the temperature, the external magnetic field, and the angle between the field and the Fe(Se,Te) film. The scaling procedure based on the anisotropic Ginzburg-Landau approach is successfully applied to the observed angular dependence of the critical voltage V*. Anyway, we find out that Fe(Se,Te) represents the case study of a layered material characterized by a weak anisotropy of its static superconducting properties, but with an increased anisotropy in its vortex dynamics due to the predominant perpendicular component of the external applied magnetic field. Indeed, I* shows less sensitivity to angle variations, thus being promising for high field applications.

Published
2018

21. Effects of high-energy proton irradiation on the superconducting properties of Fe(Se,Te) thin films

Author

Laura Gozzelino, Giulia Sylva, Antonio Leo, Angela Nigro, Valeria Braccini, Gaia Grimaldi, Marina Putti, Ilaria Pallecchi, Daniele Torsello, Gianluca Ghigo, Luca Pellegrino, E. Bellingeri, C. Ferdeghini, and Alberto Martinelli

Subjects
Materials Chemistry2506 Metals and Alloys, Materials science, iron-based superconductors, FOS: Physical sciences, Context (language use), 02 engineering and technology, Substrate (electronics), proton irradiation, thin films, Ceramics and Composites, Condensed Matter Physics, 2506, Electrical and Electronic Engineering, 01 natural sciences, Superconductivity (cond-mat.supr-con), Electrical resistivity and conductivity, 0103 physical sciences, Materials Chemistry, Irradiation, Thin film, 010306 general physics, Critical field, Superconductivity, Condensed matter physics, Condensed Matter - Superconductivity, Transition temperature, Metals and Alloys, 021001 nanoscience & nanotechnology, iron-based superconductors, proton irradiation, thin films, 0210 nano-technology
Abstract

In this paper we explore the effects of 3.5 MeV proton irradiation on Fe(Se,Te) thin films grown on CaF2. In particular, we carry out a systematic experimental investigation with different irradiation fluences up to 7.30x10^16 cm^-2 and different proton implantation depths, in order to clarify whether and to what extent the critical current is enhanced or suppressed, what are the effects of irradiation on the critical temperature, the resistivity and the critical magnetic fields, and finally what is the role played by the substrate in this context. We find that the effect of irradiation on superconducting properties is generally small as compared to the case of other iron-based superconductors. Such effect is more evident on the critical current density Jc, while it is minor on the transition temperature Tc, on the normal state resistivity and on the upper critical field Hc2 up to the highest fluences explored in this work. In addition, our analysis shows that when protons implant in the substrate far from the superconducting film, the critical current can be enhanced up to 50% of the pristine value at 7 T and 12 K, while there is no appreciable effect on critical temperature and critical fields together with a slight decrease in resistivity. On the contrary, when the implantation layer is closer to the film-substrate interface, both critical current and temperature show a decrease accompanied by an enhancement of the resistivity and the lattice strain. This result evidences that possible modifications induced by irradiation in the substrate may affect the superconducting properties of the film via lattice strain. The robustness of the Fe(Se,Te) system to irradiation induced damage makes it a promising compound for the fabrication of magnets in high-energy accelerators., Comment: 14 pages, 11 figures, submitted to Superconductor Science and Technology

Published
2018

22. Potentiality for Low Temperature—High Field Application of Iron Chalcogenide Thin Films

Author

Ettore Sarnelli, Renato Buzio, E. Reich, Emilio Bellingeri, Carlo Ferdeghini, S. Kawale, Alberto Sala, Bernhard Holzapfel, M. Adamo, Chiara Tarantini, Valeria Braccini, Mario Putti, and A. Gerbi

Subjects
Superconductivity, Josephson effect, Flux pinning, Materials science, Condensed matter physics, Transition temperature, Electrical and Electronic Engineering, Thin film, Condensed Matter Physics, Anisotropy, Critical field, Electronic, Optical and Magnetic Materials, Pulsed laser deposition
Abstract

Among the various families of Fe-based superconductors, iron chalcogenides, while presenting a transition temperature not particularly high, show great advantages for potential applications at high fields, albeit at liquid helium temperature. In fact, the critical temperature can be increased by stress up to 21 K in thin films, moreover stress can push the critical field up to more than 50 T, and the irreversibility field up to of 45 T. Also critical current densities higher than 1 MA/cm 2 can be reached in self field and at 4.2 K, with a very weak dependence on the magnetic field. Interestingly, the J C anisotropy depends on the mode of growth and substrate used. These high values of J C can be achieved without appreciable anisotropy. In this work, we present an overview of Fe(Se 0.5 Te 0.5 ) thin film deposition by pulsed laser ablation, and a study of their superconducting properties. STM and TEM techniques have been used to characterise structural and morphological properties and, thus, pinning centres. On different substrates the films grow with different types of defects, hence giving totally different J C anisotropy. Our preliminary measurements on a Josephson junction show that in Fe(Se,Te), the J C at the grain boundary is not severely depressed, which makes this material even more interesting from the practical point of view.

Published
2015

23. Investigation of inter-grain critical current density in Bi2Sr2CaCu2O8+d superconducting wires and its relationship with the heat treatment protocol

Author

A. Leveratto, A Malagoli, Valeria Braccini, V. Zunino, and I. Pallecchi

Subjects
Work (thermodynamics), Materials science, Fabrication, FOS: Physical sciences, 02 engineering and technology, 01 natural sciences, law.invention, Superconductivity (cond-mat.supr-con), law, 0103 physical sciences, Materials Chemistry, Proximity effect (superconductivity), Electrical and Electronic Engineering, Crystallization, 010306 general physics, Phase diagram, Superconductivity, Condensed matter physics, Condensed Matter - Superconductivity, Doping, Metals and Alloys, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Ceramics and Composites, Grain boundary, 0210 nano-technology
Abstract

In this work we investigate the effect of each different heat treatment stage in the fabrication of Bi2Sr2CaCu2O8+d superconducting wires on intra-grain and inter-grain superconducting properties. We measure magnetic critical temperature Tc values and transport critical current density Jc at temperatures from 4 K to 40 K and in fields up to 7 T. From an analysis of the temperature dependence of the self-field critical current density Jc(T) that takes into account weak link behavior and proximity effect, we study the grain boundaries (GB) transparency to supercurrents and we establish a relationship between GB oxygenation in the different steps of the fabrication process and the GB transparency to supercurrents. We find that grain boundary oxygenation starts in the first crystallization stage, but it becomes complete in the plateau at 836 {\deg}C and in slow cooling stages, and is further enhanced in the prolonged post annealing step. Such oxygenation makes GBs more conducting, thus improving the inter-grain Jc value and temperature dependence. On the other hand, from the inspection of the Tc values in the framework of the phase diagram dome, we find that grains are oxygenated already in the crystallization step up to the optimal doping, while successive slow cooling and post annealing treatments further enhance the degree of overdoping, especially if carried out in oxygen atmosphere rather than in air.

Published
2017

24. Fe(Se,Te) coated conductors deposited on simple rolling-assisted biaxially textured substrate templates

Author

Carlo Ferdeghini, Antonella Mancini, Angelo Vannozzi, Alessandro Rufoloni, G. Celentano, Mario Putti, Emilio Bellingeri, Andrea Augieri, Valeria Braccini, Giulia Sylva, Sylva, G., Augieri, A., Mancini, A., Rufoloni, A., Vannozzi, A., Celentano, G., Bellingeri, E., Ferdeghini, C., Putti, M., and Braccini, V.

Subjects
CeO, coated conductor, Materials science, Fe(Se, RABiTS, coated conductors, Metals and Alloys, Substrate (printing), Fe(Se, Te), Te), Condensed Matter Physics, Template, 2, buffer, thin films, Simple (abstract algebra), Materials Chemistry, Ceramics and Composites, Electrical and Electronic Engineering, Composite material, Thin film, Electrical conductor
Abstract

In this paper we study the feasibility of Fe(Se, Te) coated conductors on a simple rolling-assisted biaxially textured substrate (RABiTS) template. Starting from commercially available Ni-5 at% W tapes which show an out-of-plane orientation of about 7° and an in-plane orientation around 5°, we realized a RABiTS template for Fe(Se, Te) coated conductor fabrication by depositing CeO2 thin films on the metallic tape. The oxide buffer layers, deposited via pulsed laser ablation, exhibit an out-of-plane and an in-plane orientation suitable for Fe(Se, Te) deposition and act as a chemical barrier against Ni diffusion. Fe(Se, Te) thin films deposited on such a simple template show a superconducting transition at 16 K and very high upper critical field values with a ΔT c,0 of only 3 K in 18 T. The transport critical current reaches values of 1.7 × 105 A cm-2 at 4.2 K in self-field and is reduced by less than one order of magnitude up to 18 T, remaining isotropic with respect to the magnetic field direction.

Published
2019

26. Study of the Superconducting and Thermal Properties of ex situ GlidCop-Sheathed Practical $\hbox{MgB}_{2}$ Conductors

Author

C. Fanciulli, Andrea Malagoli, Matteo Tropeano, Marina Putti, G. Romano, Carlo Ferdeghini, Maurizio Vignolo, C. Bernini, V. Cubeda, and Valeria Braccini

Subjects
Superconductivity, Materials science, superconductivity, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Conductor, chemistry.chemical_compound, Thermal conductivity, chemistry, Electrical resistivity and conductivity, Glidcop, Magnesium diboride, Thermal stability, Electrical and Electronic Engineering, Composite material, Electrical conductor
Abstract

In dc and ac practical applications of MgB2 superconducting wires, an important role is represented by the material sheath that has to provide, among other things, a suitable electrical and thermal stabilization. One way to obtain a large-enough amount of low-resistivity material into the conductor architecture is to use it as the external sheath. In this paper, we study ex situ multifilamentary MgB2 wires fabricated with oxide-dispersion-strengthened copper (GlidCop) as the external sheath in order to reach a good compromise between critical current density and thermal properties. We prepared three GlidCop samples with different contents of dispersed submicroscopic Al2O3 particles. We characterized the superconducting and thermal properties, and we showed that the good thermal conductivity, together with the good mechanical properties and a reasonable critical current density, makes the GlidCop composite wire a useful conductor for applications where high thermal conductivity is required at temperatures above 30 K, such as superconducting fault-current limiters.

Published
2009

27. High-Energy Ball Milling and Synthesis Temperature Study to Improve Superconducting Properties of ${\rm MgB}_{2}$Ex-situ Tapes and Wires

Author

Matteo Tropeano, Cristina Bernini, Marina Putti, Andrea Malagoli, Carlo Ferdeghini, Maurizio Vignolo, G Romano, Carlo Fanciulli, and Valeria Braccini

Subjects
Superconductivity, Condensed Matter - Materials Science, High energy, Materials science, Condensed matter physics, Magnesium, Condensed Matter - Superconductivity, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, chemistry.chemical_element, Sintering, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Superconductivity (cond-mat.supr-con), chemistry, Critical current, Electrical and Electronic Engineering, Composite material, Ball mill
Abstract

MgB2 monofilamentary nickel-sheated tapes and wires were fabricated by means of the ex-situ powder-in-tube method using either high-energy ball milled and low temperature synthesized powders. All sample were sintered at 920 C in Ar flow. The milling time and the revolution speed were tuned in order to maximize the critical current density in field (Jc): the maximum Jc value of 6 x 10e4 A/cm2 at 5 K and 4 T was obtained corresponding to the tape prepared with powders milled for 144h at 180rpm. Vorious synthesis temperature were also investigated (730-900 C) finding a best Jc value for the wire prepared with powders synthesized at 745 C. We speculate that this optimal temperature is due to the fluidifying effect of unreacted magnesium content before the sintering process which could better connect the grains.

Published
2009

28. Improvement of Magnetic Field Behavior of Ex-Situ Processed Magnesium Diboride Tapes

Author

Antonio Sergio Siri, G. Grasso, G. Romano, C. Bernini, Valeria Braccini, Maurizio Vignolo, Matteo Tropeano, C. Fanciulli, Andrea Malagoli, and A. Tumino

Subjects
Superconductivity, Flux pinning, High-temperature superconductivity, Materials science, Condensed matter physics, SUPERCONDUCTING PROPERTIES, MGB2 TAPES, Superconducting magnet, Condensed Matter Physics, Grain size, Electronic, Optical and Magnetic Materials, Magnetic field, law.invention, SQUID, chemistry.chemical_compound, chemistry, law, Magnesium diboride, TRANSPORT CRITICAL CURRENTS, Electrical and Electronic Engineering, Composite material, CRITICAL-CURRENT DENSITY, IRREVERSIBILITY FIELD
Abstract

MgB2 tapes have been synthesized through the ex-situ Powder-In-Tube (PIT) method. This technique involves the cold working of tubes of various metals-in this case Ni-previously filled by suitably reacted MgB2 powders, followed by proper heat treatments. In particular, it allows the use of different starting powders and the control over their properties. We studied the influence of the starting powders on the superconducting properties of the final conductors, and we tried to improve their behavior in magnetic field by mastering their grain size and by inserting appropriate doping. In order to improve the pinning properties of the tapes, the granulometry has been varied through ball-milling of MgB2, and different dopants-such as carbon or SiC nanoparticles-, have been introduced either on the precursors or on MgB2. Critical current measurements on the tapes are presented, both magnetic from the SQUID and transport in high magnetic field. In particular, TV characteristics have been measured up to 13 Tesla at GHMFL (Grenoble) in order to extract the critical current in two directions, i.e. with the field perpendicular and parallel to the tape surface.

Published
2007

29. Strong Enhancement of Critical Current Density in MgB$_{2}$ Bulk and Ni-Sheathed Tapes With Very Small ${{\hbox{Dy}}}_{2}{\hbox{O}}_{3}$ Additions

Author

Judith L. MacManus-Driscoll, Andrea Malagoli, Valeria Braccini, Soo Kien Chen, G. Grasso, and M. Wei

Subjects
High-temperature superconductivity, Flux pinning, Materials science, Magnetoresistance, Condensed matter physics, Analytical chemistry, chemistry.chemical_element, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, law.invention, Nickel, chemistry, law, Nano, Grain boundary, Crystallite, Electrical and Electronic Engineering, Current density
Abstract

A series of polycrystalline samples were prepared by in situ reaction of Dy2O3 (0.5-5.0 wt.%) with Mg + B. While the superconducting transition temperature, Tc remained largely unchanged, the intragrain distribution of nano precipitates of DyB4 and MgO led to strong enhancement in critical current density, Jc at lower field below 4 T. The best sample (with only 0.5 wt.% Dy2O3 additions) had a Jc (1 T) of around a factor of 4 higher compared to the pure sample at 6 K and 20 K indicating improved connectivity and pinning. On the other hand, ex situ Ni-sheathed tapes fabricated from the Dy2O3 added powders exhibited critical current, Ic (4.2 K) superior to those made from pure MgB2 powders at higher field above 3 T. The former also showed lower anisotropy in Ic with respect to field direction.

Published
2007

30. MgB2multifilamentary tapes: microstructure, chemical composition and superconducting properties

Author

Giovanni Grasso, Oliver Eibl, Thomas Wenzel, A. Tumino, Balaji Birajdar, and Valeria Braccini

Subjects
Yield (engineering), Materials science, Metals and Alloys, Intermetallic, chemistry.chemical_element, Electron microprobe, Condensed Matter Physics, Mole fraction, Microstructure, Grain size, chemistry, Materials Chemistry, Ceramics and Composites, Electrical and Electronic Engineering, Composite material, Boron, Chemical composition
Abstract

Multifilamentary Ni-sheathed Cu-stabilized MgB2 tapes with a critical current density of 2.0 × 105 A cm−2 (at 20 K and 1 T) were prepared by a powder in tube technique, using pre-reacted MgB2 powders. The microstructure and chemical composition of the superconducting core and the MgB2–Ni interface were studied using SEM, EPMA and TEM. A quick, reliable and standard-less method of B quantification using SEM-EDX is established for the analysis of MgB2 wires and tapes. Carbon-contamination-free sample preparation was crucial for the analysis of boron. The typical size of MgB2 colonies, i.e. the arrangement of several well connected grains, in the MgB2 filaments was between 1 and 6 µm. The colonies are structurally well connected to each other, although sub-micrometre-sized voids are present. The B to Mg mole fraction ratio in the MgB2 colonies was found to be close to two and the O mole fraction is less than 1 at.%. The typical size of the MgB2 grains in the colonies is about 0.5–1 µm; however, numerous grains of size 30–200 nm are also present. MgO precipitates of the size of 15–70 nm were found in the MgB2 grains. Long straight dislocations with a density of 1 × 1010 cm−2 are observed. Non-superconducting layers which appear as oxide layers in SEM and TEM samples were found on the surface of the MgB2 colonies and yield poor connectivity between the colonies. It is expected that these layers yield a significant reduction of the critical current density Jc. A 10 µm wide intermetallic reaction layer of B, Mg and Ni is formed at the MgB2–Ni interface. Reduction of the MgB2 grain size by milling of starting MgB2 powder and elimination of non-superconducting layers around MgB2 colonies could further enhance the critical current density because of improved pinning and connectivity between colonies.

Published
2006

31. <tex>$rm MgB_2$</tex>Tapes With Non-Magnetic Sheath: Effect of the Sintering Temperature on the Superconducting Properties

Author

G. Grasso, Davide Nardelli, C. Bernini, Andrea Malagoli, C. Fanciulli, Valeria Braccini, A. Tumino, and Antonio Sergio Siri

Subjects
Superconductivity, Flux pinning, Materials science, High-temperature superconductivity, Condensed matter physics, Sintering, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Magnetic field, law.invention, chemistry.chemical_compound, chemistry, law, Phase (matter), Magnesium diboride, Electrical and Electronic Engineering, Critical field
Abstract

A nonmagnetic sheath, namely a Ni/Cr alloy (Ni80/Cr20), was used to fabricate MgB/sub 2/ tapes through the powder-in-tube (PIT) ex-situ technique. A series of samples sintered at different temperatures between 200/spl deg/C and 950/spl deg/C were prepared in order to correlate all the superconducting properties between them and with the sintering temperature. The possibility of using a nonmagnetic but at the same time hard sheath chemically compatible with the MgB/sub 2/ phase made possible a simpler interpretation of transport and magnetic measurements in magnetic field. With the chosen cold working parameters, we found that the amount of MgB/sub 2/ lattice strain was not sufficient to produce any enhancement of the upper critical field. The effect of the heat treatment temperature was on one hand to increase the grain connectivity but also to reduce the pinning properties of the superconductor.

Published
2005

32. Nanoscale-SiC doping for enhancing Jc and Hc2 in superconducting MgB2

Author

Valeria Braccini, David C. Larbalestier, Shi Xue Dou, Xiaolin Wang, Robert F. Klie, S. Soltanian, S. Li, and Yimei Zhu

Subjects
Superconductivity (cond-mat.supr-con), Superconductivity, Magnetic measurements, Residual resistivity, Materials science, Condensed matter physics, Impurity, Electrical resistivity and conductivity, Condensed Matter - Superconductivity, Doping, FOS: Physical sciences, General Physics and Astronomy, Nanoscopic scale
Abstract

The effect of nanoscale-SiC doping of MgB2 was investigated using transport and magnetic measurements. It was found that there is a clear correlation between the critical temperature Tc, the resistivity r, the residual resistivity ratio, RRR = R(300K)/R(40K), the irreversibility field H* and the alloying state in the samples. SiC-doping introduced many nano-scale precipitates, provoking an increase of r(40K) from 1 mW-cm (RRR = 15) for the clean limit sample to 300 mW-cm (RRR = 1.75) for the SiC-doped sample, leading to significant enhancement of Hc2 and H* with only minor effect on Tc. EELS analysis revealed a number of nano-scale impurity phases: Mg2Si, MgO, MgB4, BOx, SixByOz, BC and unreacted SiC in the doped sample. TEM study showed an extensive domain structure of 2-4nm domains induced by SiC doping. The Jc for the 10% nano-SiC doped sample increased substantially at all fields and temperatures compared to the undoped samples, due to the strong increase in Hc2 and H* produced by SiC doping.

Published
2004

33. Inter- and intragranular nanostructure and possible spinodal decomposition in low-resistivity bulk MgB2 with varying critical fields

Author

David C. Larbalestier, Xueyan Song, and Valeria Braccini

Subjects
Superconductivity, Spinodal, Materials science, Condensed matter physics, Spinodal decomposition, Mechanical Engineering, Condensed Matter Physics, Microstructure, Amorphous solid, Crystallography, Mechanics of Materials, Electrical resistivity and conductivity, General Materials Science, Grain boundary, Porosity
Abstract

Three electromagnetically well-characterized bulk samples with nominal resistivities at 40 K [ρ(40 K)], varying from 1 to 18 μΩcm, were investigated by conventional and high-resolution transmission electron microscopy. Clean, coherent, or semi-coherent grain boundaries and dirty-grain boundaries wetted by amorphous phases were found in all three samples, even though the starting sample A had the very low resistivity of 1 μΩcm at 40 K, characteristic of clean-limit samples. Taking into account its porosity and wetted-grain boundary area, the true resistivity value is about 0.5 μΩcm. Additional samples B and C, prepared by exposing sample A to Mg vapor, showed enhanced ρ(40 K) values of 14 and 18 μΩcm, without noticeable change in either inter- or intra-granular microstructure. Intragranular nanoprecipitates with characteristics of a spinodal of MgB7, with a size of 1–5 nm, were observed in a few areas of samples A and B at high local density; however at too low an overall density to explain the increased resistivities and upper critical fields.

Published
2004

34. Magnetic field dependence of the critical current in MgB/sub 2/ and Bi-2223 superconducting tapes fabricated by the powder-in-tube method

Author

Carlo Ferdeghini, G. Volpini, G. Grasso, C. Vignola, Luciano Martini, V. Previtali, Valeria Braccini, A. Tumino, Andrea Malagoli, and Antonio Sergio Siri

Subjects
Superconductivity, Materials science, High-temperature superconductivity, Magnetic domain, Condensed matter physics, Liquid helium, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Magnetic field, law.invention, chemistry.chemical_compound, chemistry, law, Magnesium diboride, Electrical and Electronic Engineering, Electrical conductor, Type-II superconductor
Abstract

The transport properties of powder-in-tube processed superconducting tapes based on the Bi-2223 and MgB/sub 2/ compounds were measured at liquid helium temperature as a function of the magnetic field amplitude and orientation with respect to the conductors. Critical current measurements on short samples were performed in a magnetic field up to 20 T. From this data, we found that commercial multifilamentary Bi-2223 tapes, in spite of the well-established processing route, show some differences over a standard common trend, if manufactured by different suppliers. Nevertheless they all carried remarkable transport currents up to the highest magnetic field of measurement. The transport properties of MgB/sub 2/ tapes presented very different features depending on the thermo-mechanical treatment they were subjected to during the fabrication process. A small critical current was measured at a field as high as 16 T on a multifilamentary MgB/sub 2/ tape. In the magnetic field domain below 1 T, MgB/sub 2/ tapes carried critical currents in excess of 1000 A at a critical current density of greater than 4/spl middot/10/sup 5/ A/cm/sup 2/.

Published
2003

35. FABRICATION AND CHARACTERIZATION OF N<font>i</font>-SHEATHED M<font>g</font>B2 SUPERCONDUCTING TAPES

Author

Emilio Bellingeri, Antonio Sergio Siri, Giovanni Grasso, Andrea Malagoli, M. Modica, S. Roncallo, Carlo Ferdeghini, A. Tumino, and Valeria Braccini

Subjects
Superconductivity, Materials science, Fabrication, Liquid helium, chemistry.chemical_element, Statistical and Nonlinear Physics, Core (manufacturing), Condensed Matter Physics, law.invention, Magnetic field, Cross section (physics), Nickel, chemistry, law, Electromagnetic coil, Composite material
Abstract

The preparation route for Nickel-sheathed MgB2 tapes has been studied in order to achieve improved transport properties at temperatures above that of liquid helium. Superconducting tapes have been manufactured by the Powder-In-Tube method, that consists in the cold working of a Nickel tube filled by reacted MgB2 powders, and in a final heat treatment carried out in Argon atmosphere. The could working procedure has been tuned in order to achieve the highest degree of MgB2 density, while limiting the formation of sausaging of the superconducting core cross section. The effect of the final heat treatment has been studied both on the superconducting and microstructural properties of the MgB2 tapes. The critical current of the reacted MgB2 tapes has been measured as a function of the magnetic field and of the temperature on short samples as well as on a small pancake coil. Finally, the microstructural and XRD analyses have revealed the clear presence of a MgB2Ni2.5 reaction layer between the Nickel sheath and the Nickel sheath and the MgB2 superconducting core in the reacted samples.

Published
2003

36. Neutron scattering studies of superconducting MgB2tapes

Author

M. Modica, Andrea Malagoli, Valeria Braccini, Antonio Sergio Siri, Giovanni Grasso, and Emilio Bellingeri

Subjects
Superconductivity, Materials science, Wire drawing, Neutron diffraction, Metals and Alloys, Sintering, Neutron scattering, Condensed Matter Physics, Residual stress, Materials Chemistry, Ceramics and Composites, Electrical and Electronic Engineering, Composite material, Penetration depth, Type-II superconductor
Abstract

The capability of manufacturing long superconducting MgB2 wires with already remarkable critical currents makes this material a very promising candidate for future applications. Tapes are prepared by the powder-in-tube technique. After the cold working procedure typically carried out by wire drawing and cold rolling, it has been found that a final sintering step carried out in argon atmosphere is a key process for further improving the superconducting properties of the conductors. To study the effect of the deformation and heat treatment processes, we performed neutron scattering experiment. Due to the high penetration depth of neutron inside matter, it was possible to analyse the MgB2 phase still wrapped in the Ni sheath. Our studies were carried out by a full spectra refinement by the Rietveld method. In the starting superconducting powder a large Mg deficiency was observed. In the tapes we found that the large forces applied during the cold working induced a large MgB2 lattice deformation, and that it is partly relaxed during the final sintering process. An important correlation of the residual stress with the critical temperature and the pinning properties was pointed out. We also observed the appearance of detrimental secondary phases during the sintering process. In particular, the MgB2 phase reacted with the nickel sheath and MgB2Ni2.5 was formed at temperatures higher than 850 °C. These results are of basic importance for a further optimization of the transport properties at moderate fields where applications of MgB2 tapes are already envisageable.

Published
2003

37. Two-band effects in the transport properties of MgB2

Author

Pietro Manfrinetti, F. Napoli, A. Palenzona, M. Putti, Antonio Sergio Siri, E. Galleani, Valeria Braccini, and I. Pallecchi

Subjects
Superconductivity, Materials science, Condensed matter physics, Condensed Matter - Superconductivity, Metals and Alloys, FOS: Physical sciences, Electronic structure, Condensed Matter Physics, Thermal conduction, Superconductivity (cond-mat.supr-con), Residual resistivity, Thermal conductivity, Electrical resistivity and conductivity, Thermal, Materials Chemistry, Ceramics and Composites, Electrical and Electronic Engineering, Type-II superconductor
Abstract

We present resistivity and thermal conductivity measurements on bulk samples, prepared either by a standard method or by a one-step technique. The latter samples, due to their high density and purity, show residual resistivity values as low as 0.5 mW cm and thermal conductivity values as high as 215 W/mK, higher than the single crystal ones. Thermal and electrical data of all the samples are analysed in the framework of the Bloch-Gruneisen equation giving reliable parameter values. In particular the temperature resitivity coefficient, obtained both from resistivity and thermal conductivity, in the dirty sample comes out ten time larger than in the clean ones. This result supports the hypothesis of ref. [1] that p and s bands conduct in parallel, prevailing p conduction in clean samples and s conduction in dirty samples ., Comment: 8 pages, 5 figures, Presented at the BOROMAG workshop, June 17-19 2002, Genoa, Italy

Published
2002

38. Transport properties of powder-in-tube processed MgB2 tapes

Author

Emilio Bellingeri, Antonio Sergio Siri, S. Roncallo, Daniele Marré, Valeria Braccini, Andrea Malagoli, N. Scati, and Giovanni Grasso

Subjects
Diffraction, Superconductivity, Materials science, Condensed matter physics, Magnetoresistance, MgB2 superconductors, Energy Engineering and Power Technology, Applications of high-Tc superconductors, Critical current density, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Magnetic field, chemistry.chemical_compound, chemistry, Electrical and Electronic Engineering, Electronic, Magnesium diboride, Perpendicular, Optical and Magnetic Materials, Anisotropy, Current density
Abstract

Nickel-sheathed magnesium diboride superconducting tapes have been fabricated by the powder-in-tube method from reacted commercially available powders. At 4.2 K and self field, a transport current density value j c of 10 5 A/cm 2 has been reached over long portions of unsintered monofilamentary tapes. The irreversibility lines both for a magnetic field oriented parallel and perpendicular to the MgB 2 superconducting tape have been determined by magnetoresistance measurements, showing some degree of anisotropy. These data are consistent with the X-ray diffraction observation of a slight texturing process of the MgB 2 grains occurring during the cold working procedure.

Published
2002

39. Fe(Se,Te) superconducting quantum interference devices

Author

A. Leveratto, Emilio Bellingeri, Ettore Sarnelli, Carlo Ferdeghini, Valeria Braccini, and Ciro Nappi

Subjects
Superconductivity, Materials science, Condensed matter physics, Metals and Alloys, Theoretical models, 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Magnetic field, Condensed Matter::Materials Science, Amplitude, Tilt (optics), Condensed Matter::Superconductivity, 0103 physical sciences, Quantum interference, Materials Chemistry, Ceramics and Composites, Grain boundary, Electrical and Electronic Engineering, 010306 general physics, 0210 nano-technology, Voltage
Abstract

We have fabricated and analyzed bicrystal grain boundary superconducting quantum interference devices made by Fe(Se,Te) superconductors, grown on [001] tilt SrTiO3 bicrystal substrates. We have realized several devices using the so-called hole-type geometry, with different loop inductances and different junction widths. Modulations of the voltage under an external applied magnetic field have been observed for three samples. Voltage amplitudes of the order of few microvolt have been measured. The maximum magnetic flux-to-voltage transfer parameter value that we have observed has been . The experimental data are analyzed in the famework of existing theoretical models.

Published
2017

40. Groove-rolling as an alternative process to fabricate Bi-2212 wires for practical applications

Author

Marina Putti, Andrea Malagoli, Valeria Braccini, Xavier Chaud, Maurizio Vignolo, Centre National de la Recherche Scientifique (CNRS), Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Laboratoire national des champs magnétiques intenses - Grenoble (LNCMI-G), Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, CNR-INFM-LAMIA, Consiglio Nazionale delle Ricerche (CNR), Université Joseph Fourier - Grenoble 1 (UJF)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), and Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)

Subjects
Superconductivity, Fabrication, Materials science, Condensed matter physics, Condensed Matter - Superconductivity, Metals and Alloys, Compaction, FOS: Physical sciences, Deformation (meteorology), Condensed Matter Physics, Square (algebra), Power (physics), Superconductivity (cond-mat.supr-con), [PHYS.HIST]Physics [physics]/Physics archives, Magnet, Materials Chemistry, Ceramics and Composites, Electrical and Electronic Engineering, Composite material, superconducting cables, ComputingMilieux_MISCELLANEOUS, Groove (music)
Abstract

Bi2Sr2CaCu2O8+x (Bi-2212) superconducting long-length wires are mainly limited in obtaining high critical currents densities (JC) by the internal gas pressure generated during the heat treatment, which expands the wire diameter and dedensifies the superconducting filaments. Several ways have been developed to increase the density of the superconducting filaments and therefore decreasing the bubble density: much higher critical currents have been reached always acting on the final as-drawn wires. We here try to pursue the same goal of having a denser wire by acting on the deformation technique, through a partial use of the groove-rolling at different wire processing stages. Such technique has a larger powders compaction power, is straightforwardly adaptable to long length samples, and allows the fabrication of samples with round, square or rectangular shape depending on the application requirements. In this paper we demonstrate the capability of this technique to increase the density in Bi-2212 wires which leads to a three-fold increase in Jc with respect to drawn wires, making this approach very promising for fabricating Bi-2212 wires for high magnetic field magnets, i.e. above 25 T.

Published
2014

41. High field vortex phase diagram of Fe(Se, Te) thin films

Author

Alberto Sala, Uli Zeitler, Jan Jaroszynski, Luca Pellegrino, Valeria Braccini, Federico Caglieris, Carlo Ferdeghini, A. Jost, G. Lamura, Emilio Bellingeri, Mario Putti, Chiara Tarantini, and S. Kawale

Subjects
Materials science, Condensed matter physics, Isotropy, Metals and Alloys, superconductivily, thin films, Condensed Matter Physics, 7. Clean energy, Vortex, Magnetic field, symbols.namesake, thin films, Electrical resistivity and conductivity, Condensed Matter::Superconductivity, Lattice (order), Materials Chemistry, Ceramics and Composites, symbols, Electrical and Electronic Engineering, Thin film, superconductivily, Phase diagram, Nernst effect
Abstract

We report on the (H, T) vortex phase diagram up to 35 T of Fe(Se, Te) thin films deposited on CaF2 substrates as determined by resistivity, Nernst effect and critical current measurements. We found the presence of a large region where the vortex is firmly pinned, allowing the adoption of chalcogenides for low temperature but extremely high magnetic field applications. The fact that high critical current density values—larger than 1 MA cm−2 in self-field and liquid helium—are reached together with a very weak dependence on the magnetic field and a complete isotropy, joined with the very high rigidity of the vortex lattice at very high field, makes the Fe(Se, Te) phase very promising for low temperature (≤4.2 K) and high field (≥25 T) applications.

Published
2014

42. Large critical current density improvement in Bi-2212 wires through groove-rolling process

Author

Mario Putti, François Debray, C. Bernini, G Romano, Valeria Braccini, Andrea Malagoli, Xavier Chaud, University of Bari Aldo Moro (UNIBA), CNR-INFM-LAMIA, Consiglio Nazionale delle Ricerche (CNR), Centre National de la Recherche Scientifique (CNRS), Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Laboratoire national des champs magnétiques intenses - Grenoble (LNCMI-G), Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Université Joseph Fourier - Grenoble 1 (UJF)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), and Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)

Subjects
magnet, high Tc superconductor, Materials science, Fabrication, FOS: Physical sciences, 02 engineering and technology, Deformation (meteorology), 01 natural sciences, Superconductivity (cond-mat.supr-con), 0103 physical sciences, Materials Chemistry, Electrical and Electronic Engineering, 010306 general physics, Groove (engineering), Electrical conductor, ComputingMilieux_MISCELLANEOUS, Superconductivity, Condensed Matter - Superconductivity, Metals and Alloys, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Engineering physics, [PHYS.HIST]Physics [physics]/Physics archives, Ceramics and Composites, Electric current, Current (fluid), 0210 nano-technology, Current density
Abstract

Recently the interest about Bi-2212 round wire superconductor for high magnetic field use has been enhancing despite the fact that an increase of the critical current is still needed to boost its successful use in such applications. Recent studies have demonstrated that the main obstacle to current flow, especially in long wires, is the residual porosity inside these Powder-In-Tube processed conductors which develops in bubbles-agglomeration when the Bi-2212 melts. Through this work we tried to overcome this issue acting on the wire densification by changing the deformation process. Here we show the effects of groove-rolling versus drawing process on the critical current density JC and on the microstructure. In particular, groove-rolled multifilamentary wires show a JC increased by a factor of about 3 with respect to drawn wires prepared with the same Bi-2212 powder and architecture. We think that this approach in the deformation process is able to produce the required improvements both because the superconducting properties are enhanced and because it makes the fabrication process faster and cheaper.

Published
2013

43. Comparison of Superconducting Properties of <formula formulatype='inline'><tex Notation='TeX'>$ \hbox{FeSe}_{0.5}\hbox{Te}_{0.5}$</tex></formula> Thin Films Grown on Different Substrates

Author

Angela Nigro, Mario Putti, S. Kawale, Emilio Bellingeri, Carlo Ferdeghini, A. Guarino, Antonio Leo, Valeria Braccini, Gaia Grimaldi, and I. Pallecchi

Subjects
Superconductivity, Materials science, Flux pinning, Condensed matter physics, 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Electronic, Optical and Magnetic Materials, Pulsed laser deposition, chemistry.chemical_compound, Lattice constant, chemistry, Lanthanum aluminate, 0103 physical sciences, Strontium titanate, Electrical and Electronic Engineering, Thin film, 010306 general physics, 0210 nano-technology, Anisotropy
Abstract

We have shown that the superconducting properties of FeSe0.5 Te0.5 thin films are strongly dependent on the growth conditions and, in particular, the in-plane lattice constant of the substrate influences the crystallographic lattice parameters of the films, affecting the strain and is responsible for strong enhancements of the critical temperature Tc and for the introduction of different pinning mechanisms. Here we compare the structural, electrical and transport properties of superconducting Fe(Se0.5, Te0.5) epitaxial films deposited through pulsed laser ablation on three different substrates namely lanthanum aluminate (LaAlO3), strontium titanate (SrTiO3), and calcium fluoride (CaF2). We analyze in particular the critical current density Jc as a function of the temperature and magnetic field, and its anisotropy, which is related to the different pinning mechanisms in play. The film grown on SrTiO3 exhibits a higher critical current when the field is perpendicular to the film surface, opposite to what happens in the sample grown on LaAlO3 due to the presence of extrinsic pinning along the c-axis, while we observe almost no anisotropy on the thin film grown on CaF2.

Published
2013

44. New concept for the development of Bi-2212 wires for high-field applications

Author

D. Contarino, Carlo Ferdeghini, Valeria Braccini, Andrea Malagoli, and A. Leveratto

Subjects
Superconductivity, Materials science, Supercurrent, Metals and Alloys, 02 engineering and technology, Mechanics, Deformation (meteorology), 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Overpressure, Phase (matter), 0103 physical sciences, Materials Chemistry, Ceramics and Composites, Development (differential geometry), High field, Electrical and Electronic Engineering, Current (fluid), 010306 general physics, 0210 nano-technology
Abstract

The first step towards high critical currents in Bi-2212 wires was recognizing that the supercurrent is blocked over long lengths by filament-diameter bubbles grown during the melt stage, which cause expansion of the wire diameter and dedensification of the superconducting filaments. While a succesful approach to reducing the problem of voids related to bubbles involved the application of a high overpressure during the heat treatment, we fabricated Bi-2212 wires by applying a new concept of suitably alternating groove-rolling and drawing techniques with the aim of densifying the phase during the working procedure prior to the heat treatment. We here for the first time were able to reach, in wires reacted with closed ends—i.e. with gas trapped in the wire as it happens in long length wires—the very same values of critical current shown in short wires reacted with open ends. This is the irrefutable evidence that, only by acting on the deformation technique, we were able to raise the critical current by properly densifying the superconducting powder inside the filaments already before the melt stage. Whole-conductor current densities in our long-length simulation wires already reach 400 A mm−2 at 4.2 K and 5 T, which can be still easily increased through architecture optimization. The actual breakthrough is that the densification is optimized without further complex treatments through a technique which can be straightforwardly applied to long length wires.

Published
2016

45. Role of weak uncorrelated pinning introduced by BaZrO3nanorods at low-temperature in(Y,Gd)Ba2Cu3Oxthin films

Author

David C. Larbalestier, Jan Jaroszynski, Aixia Xu, Y Xin, and Valeria Braccini

Subjects
Materials science, Field (physics), Condensed matter physics, Film plane, 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Uncorrelated, Electronic, Optical and Magnetic Materials, 0103 physical sciences, Nanorod, Critical current, High field, Thin film, 010306 general physics, 0210 nano-technology, Pinning force
Abstract

$\mathrm{RE}$Ba${}_{2}$Cu${}_{3}$O${}_{x}$ (REBCO) films can achieve remarkably high critical current density ${J}_{c}$ values by the incorporation of insulating nanoparticles. A particularly interesting case concerns BaZrO${}_{3}$ (BZO) nanorods which strongly enhance ${J}_{c}$ at high temperatures and fields up to a few tesla. Here we investigate the full angular transport ${J}_{c}$ over a much broader range of field (up to 31 T) and temperature (4.2--77 K), a range suitable for new very high field magnet applications. We show that the correlated $c$-axis pinning of BZO nanorods becomes progressively less obvious at lower temperatures and indeed at 4.2 K up to 31 T, the only visible correlated pinning is for fields parallel to the film plane. ${J}_{c}$ at 4.2 K is still, however, strongly enhanced by the BZO nanorods, as is clearly manifested by a remarkably high bulk pinning force density ${F}_{p}$ \ensuremath{\approx} 900 GN/m${}^{3}$ for $H$\ensuremath{\Vert}$c$, because the BZO nanorods add weak but very dense pins which contribute up to half of ${J}_{c}$ in the low temperature limit. Above about 30 K these dense but weak pins lose their effectiveness and ${J}_{c}$ then becomes dominated by the sparse but strong BZO pins. This strong temperature dependence of the dominant pinning effects of multiple pin types makes broad range characterization essential to reveal the great flexibility of pinning in modern REBCO films that is almost certainly not yet fully optimized.

Published
2012

46. Strong vortex pinning in FeSe0.5Te0.5 epitaxial thin film

Author

Emilio Bellingeri, M. Adamo, Andrea Gerbi, Valeria Braccini, E. Sarnelli, Carlo Ferdeghini, Renato Buzio, S. Kawale, M. Putti, A. Palenzona, and I. Pallecchi

Subjects
Materials science, Flux pinning, Physics and Astronomy (miscellaneous), Condensed matter physics, Field (physics), 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Magnetic field, law.invention, Vortex, law, Condensed Matter::Superconductivity, 0103 physical sciences, THIN FILMS, Scanning tunneling microscope, 010306 general physics, 0210 nano-technology, Anisotropy, Pinning force, Critical field
Abstract

We report on the magnetic field and angular dependence of the critical current density of epitaxial FeTe0.5Se0.5 thin films. The films exhibit high critical current values and weak dependence on the applied magnetic field. The Jc is larger for field parallel to the c-axis, which is the opposite behavior of what expected from the critical field anisotropy. The analysis of the activation energy for vortex motion indicates that the single pinning regime holds up to 9 T, suggesting that correlated pinning centers are more effective than the vortex-vortex interaction even at the largest applied fields. Scanning tunneling microscope analysis indicates threading dislocations as possible pinning centers.

Published
2012

47. Fabrication and superconducting properties of powder-in-tube processed MgB2 tapes

Author

S. Roncallo, Valeria Braccini, N. Scati, Giovanni Grasso, Andrea Malagoli, and Antonio Sergio Siri

Subjects
Superconductivity, Superconducting coherence length, Fabrication, Materials science, Condensed matter physics, Magnetoresistance, Energy Engineering and Power Technology, Sintering, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Coherence length, Magnetic field, Electrical and Electronic Engineering, Current density
Abstract

The powder-in-tube process has been employed to fabricate long nickel-sheathed MgB 2 superconducting tapes from reacted commercially available powders. We have found that reacted MgB 2 powders reach a high degree of density inside the nickel sheath during the cold working procedure and, thanks to the large superconducting coherence length, a considerable current flow is therefore achievable even without sintering. At 4.2 K and self-field, a transport current density value j c of 10 5 A/cm 2 has been indeed reached over long portions of unsintered monofilamentary tapes. The irreversibility lines both for a magnetic field oriented parallel and perpendicular to the MgB 2 superconducting tape have been determined by magnetoresistance measurements. These data are consistent with a slight texturing process of the MgB 2 grains occurring during the cold working procedure.

Published
2002

48. Large transport critical currents in unsintered MgB2 superconducting tapes

Author

S. Roncallo, Andrea Malagoli, Carlo Ferdeghini, Giovanni Grasso, Valeria Braccini, Antonio Sergio Siri, and M. R. Cimberle

Subjects
Superconductivity, Condensed Matter - Materials Science, Materials science, Physics and Astronomy (miscellaneous), Condensed matter physics, Condensed Matter - Superconductivity, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, Superconductivity (cond-mat.supr-con), Metal, High pressure, Phase (matter), visual_art, Ultimate tensile strength, visual_art.visual_art_medium, Critical current, Composite material, Electrical conductor
Abstract

The Powder-In-Tube process has been employed to fabricate tape-like conductors with a strong metallic sheath and based on the newly discovered MgB2 superconducting phase. Long superconducting tapes have been prepared by packing reacted MgB2 powders inside pure Ag, Cu and Ni tubes which are then cold worked by drawing and rolling. Such tapes have shown transport properties as good as bulk MgB2 samples sintered in high pressure and high temperature conditions. At 4.2 K, the highest critical current density of 100000 A/cm2 has been achieved on Nickel-sheathed single-filament conductors. A direct correlation between the sheath tensile strength and the critical current of the unsintered tape has been observed., 9 pages, 3 figures; submitted to Appl. Phys. Lett. Received April 3, 2001

Published
2001

49. Study of the MgB2 grain size role in ex-situ multifilamentary wires with thin filaments

Author

Carlo Ferdeghini, Maurizio Vignolo, Valeria Braccini, Andrea Malagoli, G Romano, C. Bernini, and M. Putti

Subjects
Materials science, FOS: Physical sciences, Context (language use), 01 natural sciences, 7. Clean energy, law.invention, Protein filament, Superconductivity (cond-mat.supr-con), Average size, law, 0103 physical sciences, Materials Chemistry, Electrical and Electronic Engineering, Composite material, 010306 general physics, Transformer, Electrical conductor, 010302 applied physics, Superconductivity, Condensed matter physics, Condensed Matter - Superconductivity, Metals and Alloys, Condensed Matter Physics, Grain size, Magnet, Ceramics and Composites
Abstract

The MgB2 superconductor has already demonstrated its applicative potential, in particular for DC applications such as MRI magnets, thanks to the low costs of the raw materials and to its simple production process. However further efforts have still to be made in order to broaden its employment also towards the AC applications such as SFCL, motors, transformers. The main issues are related to the reduction of the AC losses. Some of these can be faced by obtaining multifilamentary conductors with a large number of very fine filaments and, in this context, the powders granulometry can play a crucial role. We have prepared MgB2 starting powders with different granulometries and by the ex-situ P.I.T method we have realized multifilamentary wires with a number of filaments up to 361 and an average size of each filament lowered down to 30 microns. In particular we have studied the relationship between grain and filament size in terms of transport properties and show that the optimization of this ratio is possible in order to obtain suitable conductors for AC industrial applications.

Published
2009
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50. Role of the Grain Oxidation in Improving the In-Field Behavior of MgB(2) Ex-Situ Tapes

Author

G. Romano, Matteo Tropeano, Emilio Bellingeri, Valeria Braccini, Mario Putti, V. Honkimaki, Carlo Ferdeghini, Maurizio Vignolo, C. Bernini, Andrea Malagoli, and C. Fanciulli

Subjects
Controlled atmosphere, Flux pinning, Materials science, Scanning electron microscope, Sintering, Condensed Matter Physics, Grain size, Electronic, Optical and Magnetic Materials, chemistry.chemical_compound, chemistry, Magnesium diboride, Grain boundary, Electrical and Electronic Engineering, Composite material, Pinning force
Abstract

The grain size and the grain boundaries play an important role in determining the pinning properties and the current carrying capability of MgB2. Here we present an experimental study on the effect of grain oxidation on the superconducting properties of MgB2 ex-situ Powder-in-Tube (PIT) tapes. We fabricated Fe-sheathed monofilamentary tapes using a variety of powders synthesized in inert (IA) or oxidizing (OA) atmosphere. In order to understand the role of magnesium oxide (MgO) we studied the effect of the presence of the oxidation layer on the field dependence of the critical current density. To this purpose, we developed a process for the powder synthesis and tube filling and sealing in controlled atmosphere to reduce the oxygen contamination; with this process the connectivity of the grains in the final tapes proved to be increased. Then, we introduced a controlled oxidation step. We will show how the presence of the MgO layer enhances the critical current field dependence. High energy X-ray diffraction measurements were performed on the samples, and the grain size of the unsintered and sintered powders in the tapes was measured by means of Scanning Electron Microscopy (SEM). The pinning force was studied, and different mechanisms were found for the samples prepared in IA and OA. The different behavior shown by the two different typologies of tapes was correlated with the presence or absence of the MgO layer.

Published
2009

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