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14 results on '"d'Astuto, Matteo"'

1. Direct observation of Jahn-Teller critical dynamics at a charge-order Verwey transition

Author

Gastaldo, Vinícius Pascotto, Rao, Mala N., Bosak, Alexey, D'Astuto, Matteo, Prodi, Andrea, Verseils, Marine, Klein, Yannick, Bellin, Christophe, Paolasini, Luigi, de Oliveira, Adilson, Gilioli, Edmondo, Chaplot, Samrath Lal, Gauzzi, Andrea, Pascotto Gastaldo, Vinícius, Rao, Mala, Chaplot, Samrath, Departamento de Fisica, Universidade Federal de São Carlos, Rodovia Washington Luis, km 235 - SP-310, 13565-905 São Carlos, SP, Brazil, Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Muséum national d'Histoire naturelle (MNHN)-Institut de recherche pour le développement [IRD] : UR206-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Bhabha Atomic Research Centre (BARC), Government of India, Department of Atomic Energy, European Synchroton Radiation Facility [Grenoble] (ESRF), Magnétisme et Supraconductivité (MagSup), Institut Néel (NEEL), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Istituto dei Materiali per l'Elettronica ed il Magnetismo [Genova] (IMEM-CNR), Consiglio Nazionale delle Ricerche (CNR), Universidade Federal de São Carlos [São Carlos] (UFSCar), Magnétisme et Supraconductivité (NEEL - MagSup), and National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR)

Subjects
Strongly Correlated Electrons (cond-mat.str-el), Jahn-Teller effect, FOS: Physical sciences, 02 engineering and technology, Charge order, 021001 nanoscience & nanotechnology, 01 natural sciences, Condensed Matter - Strongly Correlated Electrons, 0103 physical sciences, Condensed Matter::Strongly Correlated Electrons, [PHYS.COND.CM-SCE]Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el], [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], 010306 general physics, 0210 nano-technology
Abstract

By means of diffuse and inelastic x-ray scattering (DS,IXS), we probe directly the charge-ordering (CO) dynamics in the Verwey system (NaMn$_3$)Mn$_4$O$_{12}$, where a peculiar quadruple perovskite structure with no oxygen disorder stabilizes a nearly full Mn$^{3+}$/Mn$^{4+}$ static charge order at $T_{\rm CO}$=175 K concomitant to a commensurate structural modulation with propagation vector ${\bf q}_{\rm CO}=(\frac{1}{2},\frac{1}{2},0)$. At $T_{\rm CO}$, the IXS spectra unveil a softening of a 35.3 meV phonon at ${\bf q}_{\rm CO}$. Lattice dynamical calculations enable us to attribute this soft phonon to a A$_g$ mode whose polarization matches the Jahn-Teller-like distortion pattern of the structural modulation. This result demonstrates that the Jahn-Teller instability is the driving force of the CO Verwey transition in (NaMn$_3$)Mn$_4$O$_{12}$, thus elucidating a long-standing controversy regarding the mechanism of this transition observed in other mixed-valence systems like magnetite.

Published
2021
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2. Doping-induced in-plane anisotropy of bond-stretching phonon softening in oxychloride Ca2−xCuO2Cl2 compounds

Author

Lebert, Blair, Yamamoto, Hajime, Azuma, Masaki, Heid, Rolf, Tsutsui, Satoshi, Uchiyama, Hiroshi, Baron, Alfred, Baptiste, Benoît, d'Astuto, Matteo, Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Muséum national d'Histoire naturelle (MNHN)-Institut de recherche pour le développement [IRD] : UR206-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Tokyo Institute of Technology [Tokyo] (TITECH), Institut für Festkörperphysik, Japan Synchrotron Radiation Research Institute [Hyogo] (JASRI), RIKEN SPring-8 Center [Hyogo] (RIKEN RSC), RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), Magnétisme et Supraconductivité (MagSup), Institut Néel (NEEL), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), and Magnétisme et Supraconductivité (NEEL - MagSup)

Subjects
[PHYS.COND.CM-S]Physics [physics]/Condensed Matter [cond-mat]/Superconductivity [cond-mat.supr-con], [PHYS.COND.CM-SCE]Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el]
Abstract

Modified version published as Phys. Rev. B 101, (2020) 020506(R) https://link.aps.org/doi/10.1103/PhysRevB.101.020506; International audience; We measure the dispersion of the Cu-O bond-stretching phonon mode in the high-temperature superconducting parent compound Ca 2 CuO 2 Cl 2. Our density functional theory calculations predict a cosine-shaped bending of the dispersion along both the (ξ00) and (ξξ0) directions, while comparison with previous results on Ca 1.84 CuO 2 Cl 2 show it only along (ξ00), suggesting an anisotropic effect which is not reproduced in calculation at optimal doping. Comparison with isostructural La 2−x Sr x CuO 4 suggests that these calculations reproduce well the overdoped regime, however they overestimate the doping effect on the Cu-O bond-stretching mode at optimal doping.

Published
2020
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3. Photoinduced filling of near-nodal gap in Bi 2 Sr 2 CaCu 2 O 8 + δ

Author

Zhang, Zhongkai, Piovera, C., Papalazarou, E., Marsi, M., d'Astuto, Matteo, van Der Beek, C. J., Taleb-Ibrahimi, A., Perfetti, L., Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire des Solides Irradiés (LSI), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X), Laboratoire de Physique des Solides (LPS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Institut de minéralogie et de physique des milieux condensés (IMPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Department of Physics and CMSE, Massachusetts Institute of Technology (MIT), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), and Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.COND.CM-S]Physics [physics]/Condensed Matter [cond-mat]/Superconductivity [cond-mat.supr-con], [PHYS.COND.CM-SCE]Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2017
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4. Observation of low energy dispersive modes in un- derdoped (La, Nd) 2−x Sr x CuO 4

Author

'Astuto, Matteo D, Denis, Sylvain, Graf, Jeff, Lanzara, Alessandra, Decorse, Claudia, Giura, Paola, Cheong, Sang-Wook, Shukla, Abhay, Berthet, Patrick, Lamago, Daniel, Castellan, John-Paul, Bossak, Alexei, Krisch, Michael, Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de recherche pour le développement [IRD] : UR206-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), Université Paris-Sud - Paris 11 (UP11)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Materials Science Division [LBNL Berkeley], Lawrence Berkeley National Laboratory [Berkeley] (LBNL), Department of Physics, Rutgers, The State University of New Jersey [New Brunswick] (RU), Rutgers University System (Rutgers), Laboratoire Léon Brillouin (LLB - UMR 12), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Saclay, Institut fur Festkorperphysik, European Synchrotron Radiation Facility (ESRF), ESRF experiment HS-2440 and HS-2689 and LLB through experiment N. 11234. U.S. Department of Energy under Contract No. DE-AC03-76SF00098. Berkeley Labs programs on 'Quantum Materials' funded by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, Material. National Science Foundation through Grant No. DMR-0349361 and DMR-0405682. University of California, Berkeley, through (France Berkeley Fund Grant)., and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)

Subjects
74.72.Gh74.72.Kf74.25.Kc63.20.kd63.20.dd78.70.Ck78.70.Nx, Strongly Correlated Electrons (cond-mat.str-el), Properties of superconductors: phonons, Condensed Matter - Superconductivity, Pseudogap regime in cuprate superconductors, Phonons in crystal lattices, FOS: Physical sciences, Phonon-electron interactions, Hole-doped cuprate superconductors, X-ray scattering, Superconductivity (cond-mat.supr-con), [PHYS.COND.CM-S]Physics [physics]/Condensed Matter [cond-mat]/Superconductivity [cond-mat.supr-con], Condensed Matter - Strongly Correlated Electrons, Neutron inelastic scattering, Condensed Matter::Superconductivity, Condensed Matter::Strongly Correlated Electrons, [PHYS.COND.CM-SCE]Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el]
Abstract

We find excitations lower in energy than known phonon modes in underdoped La$\_{2-x}$Sr$\_x$CuO$\_{4+\delta}$ (x=0.08), with both inelastic X-Ray scattering (IXS) and inelastic neutron scattering (INS). A non dispersive excitation at 9 meV is identified and is also seen by INS in (La,Nd)$\_{2-x}$Sr$\_x$CuO$\_{4+\delta}$, with 40$\%$ Nd substitution. INS also identifies a still lower energy dispersive mode at low q in the Nd free sample. These modes are clearly distinct from the longitudinal acoustic phonon and correspond in energy to the Zone Centre modes measured by optical spectroscopy and associated with stripe dynamics.

Published
2015

5. Enhancement of superconductivity and lattice instability in Graphite-Intercalated CaC6

Author

Gauzzi, Andrea, Bendiab, Nedjma, d’Astuto, Matteo, Canny, Bernard, Calandra, Matteo, Mauri, Francesco, Loupias, Geneviève, Takashima, Shinya, Takagi, Hidenori, Takeshita, Nao, Terakura, Chieko, Emery, Nicolas, Hérold, Claire, Lagrange, Philippe, Hanfland, Michael, Mezouar, Mohamed, Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de recherche pour le développement [IRD] : UR206-Centre National de la Recherche Scientifique (CNRS), Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institut de minéralogie et de physique des milieux condensés (IMPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie et des Matériaux Paris-Est (ICMPE), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Institut Jean Lamour (IJL), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), European Synchrotron Radiation Facility (ESRF), Junji Haruyama, Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de recherche pour le développement [IRD] : UR206-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), and Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015
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6. Phonon dispersion and low energy anomaly in CaC$_6$

Author

d'Astuto, Matteo, Calandra, Matteo, Bendiab, Nedjma, Loupias, G., Mauri, Francesco, Zhou, Shuyun, Graf, Jeff, Lanzara, Alessandra, Emery, N., Herold, C., Lagrange, P., Petitgrand, D., Hoesch, Moritz, Institut de minéralogie et de physique des milieux condensés (IMPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Materials Science Division [LBNL Berkeley], Lawrence Berkeley National Laboratory [Berkeley] (LBNL), Department of Physics [Berkeley], University of California [Berkeley], University of California-University of California, Laboratoire de chimie du solide minéral (LCSM), Université Paul Verlaine - Metz (UPVM)-Université Henri Poincaré - Nancy 1 (UHP)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Léon Brillouin (LLB - UMR 12), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Saclay, European Synchrotron Radiation Facility (ESRF), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS), University of California [Berkeley] (UC Berkeley), University of California (UC)-University of California (UC), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)

Subjects
Superconductivity (cond-mat.supr-con), [PHYS.COND.CM-S]Physics [physics]/Condensed Matter [cond-mat]/Superconductivity [cond-mat.supr-con], Phonon-electron and phonon-phonon interactions, Condensed Matter - Superconductivity, Superconducting binary compounds, Density functional theory, FOS: Physical sciences, Inelastic X-ray scattering, 74.70.Wz, 74.25.Kc, 63.20.dd, 63.20.dk, 63.20.kd, 78.70.Ck, 71.15.Mb
Abstract

We report measurements of phonon dispersion in CaC$_6$ using inelastic X-ray and neutron scattering. We find good overall agreement, particularly in the 50 meV energy region, between experimental data and first-principles density-functional-theory calculations. However, on the longitudinal dispersion along the $(1 1 1)$ axis of the rhombohedral representation, we find an unexpected anti-crossing with an additional longitudinal mode, at about 11 meV. At a comparable energy, we observe also unexpected intensity on the in-plane direction. These results resolve the previous incorrect assignment of a longitudinal phonon mode to a transverse mode in the same energy range. By calculating the electron susceptibility from first principles we show that this longitudinal excitation is unlikely to be due to a plasmon and consequently can probably be due to defects or vacancies present in the sample., Accepted for publication in Physical Review B

Published
2010
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7. Sharp optical phonon softening close to optimal doping in La$_{2-x}$Ba$_x$CuO$_{4+\delta}$

Author

D'Astuto, Matteo, Dhalenne, Guy, Graf, Jeff, Hoesch, Moritz, Giura, Paola, Krisch, Michael, Berthet, Patrick, Lanzara, Alessandra, Shukla, Abhay, Institut de minéralogie et de physique des milieux condensés (IMPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physico-Chimie de l'Etat Solide (CHIMSOL), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Materials Science Division [LBNL Berkeley], Lawrence Berkeley National Laboratory [Berkeley] (LBNL), European Synchrotron Radiation Facility (ESRF), Department of Physics [Berkeley], University of California [Berkeley], University of California-University of California, Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), University of California [Berkeley] (UC Berkeley), and University of California (UC)-University of California (UC)

Subjects
Condensed Matter - Strongly Correlated Electrons, Condensed Matter::Superconductivity, 74.25.Kc, 74.72.Dn, 63.20.Dj, 63.20.Kr, 78.70.Ck, [PHYS.COND.CM-SCE]Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el]
Abstract

International audience; We report a direct observation of a sharp Kohn-like anomaly in the doubly degenerate copper-oxygen bond-stretching phonon mode occurring at $\mathbf{q}\mathrm{=(0.3, 0,0)}$ in La$_{2-x}$Ba$_x$CuO$_{4+\delta}$ with $\mathrm{x=0.14\pm0.01}$, thanks to the high $\mathbf{Q}$ resolution of inelastic x-ray scattering. This anomaly is clearly seen when the inelastic signal is analysed using a single mode but is also consistent with a two mode hypothesis possibly due to a splitting of the degenerate modes due to symmetry breaking stripes. Our observation shows that the effect persists at the stripe propagation vector in a superconducting system close to optimal doping.

Published
2008
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8. Bond stretching phonon softening and kinks in the angle-resolved photoemission spectra of optimally doped Bi2Sr1.6La0.4Cu2O6+delta superconductors

Author

Graf, Jeff, D'Astuto, Matteo, Jozwiak, C., Garcia, D.R., Saini, Naurang L., Krisch, Michael, Ikeuchi, K., Baron, A Q.R., Eisaki, H., Lanzara, Alessandra, Materials Science Division [LBNL Berkeley], Lawrence Berkeley National Laboratory [Berkeley] (LBNL), Institut de minéralogie et de physique des milieux condensés (IMPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Department of Physics [Berkeley], University of California [Berkeley], University of California-University of California, Dipartimento di Fisica, Università di Roma La Sapienza, Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome], European Synchrotron Radiation Facility (ESRF), RIKEN SPring-8 Center [Hyogo] (RIKEN RSC), RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), National Institute of Advanced Industrial Science and Technology (AIST), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS), University of California [Berkeley] (UC Berkeley), University of California (UC)-University of California (UC), and Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome] (UNIROMA)

Subjects
Condensed Matter::Materials Science, DISPERSION, LATTICE-DYNAMICS, Condensed Matter::Superconductivity, 74.72.Hs, 74.25.Jb, 74.25.Kc, Condensed Matter::Strongly Correlated Electrons, [PHYS.COND.CM-SCE]Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el]
Abstract

International audience; We report the first measurement of the Cu-O bond stretching phonon dispersion in optimally doped Bi2Sr1.6La0.4Cu2O6+delta using inelastic x-ray scattering. We found a softening of this phonon at q=(approximate to 0.25,0,0) from 76 to 60 meV, similar to the one reported in other cuprates. A comparison with angle-resolved photoemission data on the same sample revealed an excellent agreement in terms of energy and momentum between the angle-resolved photoemission nodal kink and the soft part of the bond stretching phonon. Indeed, we find that the momentum space where a 63 +/- 5 meV kink is observed can be connected with a vector q=(xi,0,0) with xi >= 0.22, corresponding exactly to the soft part of the bond stretching phonon.

Published
2008

9. In-plane copper-oxygen bond-stretching mode anomaly in underdoped La2−xSrxCuO4+delta measured with high-resolution inelastic x-ray scattering

Author

Graf, Jeff, d'Astuto, Matteo, Giura, Paola, Shukla, Abhay, Saini, Naurang L., Bossak, Alexei, Krisch, Michael, Cheong, Sang-Wook, Sasagawa, Takao, Lanzara, Alessandra, Materials Science Division [LBNL Berkeley], Lawrence Berkeley National Laboratory [Berkeley] (LBNL), Institut de minéralogie et de physique des milieux condensés (IMPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Dipartimento di Fisica, Università di Roma La Sapienza, Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome], European Synchrotron Radiation Facility (ESRF), Rutgers Center for Emergent Materials and Department of Physics & Astronomy, Rutgers, Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo (UTokyo), Department of Physics [Berkeley], University of California [Berkeley], University of California-University of California, Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS), Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome] (UNIROMA), University of California [Berkeley] (UC Berkeley), and University of California (UC)-University of California (UC)

Subjects
[PHYS.COND.CM-S]Physics [physics]/Condensed Matter [cond-mat]/Superconductivity [cond-mat.supr-con], [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph], Condensed Matter::Superconductivity, 74.72.Dn, 63.20.Kr, 63.20.Dj, 74.25.Kc, Condensed Matter::Strongly Correlated Electrons, [PHYS.COND.CM-SCE]Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el]
Abstract

International audience; We have measured the lattice dynamics of underdoped La2-xSrxCuO4+ x=0.08 using high resolution inelastic x-ray scattering spectroscopy. The very good intrinsic Q resolution of this experiment allows us to differentiate between the two proposed scenarios for the Cu-O bond stretching phonon broadening reported at q=0.25,0,0. The results suggest that this phonon broadening is due to intrinsic damping rather than to a steep dispersion, having important implications on the interpretation of phonon anomalies in cuprates.

Published
2007
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10. Anharmonic effects in MgB2? A comparative inelastic X-ray scattering and Raman study

Author

D'Astuto, Matteo, Calandra, Matteo, Reich, Stephanie, Shukla, Abhay, Lazzeri, Michele, Mauri, Francesco, Karpinski, Janusz, Zhigadlo, N.D., Bossak, Alexei, Krisch, Michael, Institut de minéralogie et de physique des milieux condensés (IMPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS), Department of Materials Science and Engineering, Massachusetts Institute of Technology (MIT), Laboratory for Solid State Physics, Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), European Synchrotron Radiation Facility (ESRF), Université Pierre et Marie Curie - Paris 6 (UPMC)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Department of Materials Science and Engineering, Massachusetts Institute of Technology, Laboratory for Solid State Physics [ETH Zürich], Department of Physics [ETH Zürich] (D-PHYS), and Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich)- Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich)

Subjects
Condensed Matter - Materials Science, ab initio calculations, Condensed Matter - Superconductivity, phonon spectra, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, type II superconductors, X-ray scattering, magnesium compounds, Superconductivity (cond-mat.supr-con), [PHYS.COND.CM-S]Physics [physics]/Condensed Matter [cond-mat]/Superconductivity [cond-mat.supr-con], Condensed Matter::Superconductivity, anharmonic lattice modes, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Raman spectra, Physics::Atomic Physics, PACS: 74.70.Ad, 74.25.Kc, 63.20.Dj, 63.20.Kr
Abstract

We study anharmonic effects in MgB2 by comparing Inelastic X-ray and Ramanscattering together with ab-initio calculations. Using high statistics and high q resolution measurements we show that the E2g mode linewidth is independent of temperature along Gamma-A. We show, contrary to previous claims, that the Raman-peak energy decreases as a function of increasing temperature, a behaviour inconsistent with all the anharmonic ab-initio calculations of the E2g mode at Gamma available in literature. These findings and the excellent agreement between the X-ray measured and ab-initio calculated phonon spectra suggest that anharmonicity is not the main mechanism determining the temperature behaviour of the Raman-peak energy. The Raman E2g peak position and linewidth can be explained by large dynamical effects in the phonon self-energy. In light of the present findings, the commonly accepted explanation of the reduced isotope effect in terms of anharmonic effects needs to be reconsidered., Comment: 11 pages, 10 figures

Published
2007
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11. Low-q dispersion of transverse acoustic phonons in YBa$_2$Cu$_3$O$_{7-\delta}$

Author

Gauzzi, Andrea, D'Astuto, Matteo, Licci, Francesca, Bossak, Alexei, Krisch, Michael, Istituto dei Materiali per l'Elettronica ed il Magnetismo [Genova] (IMEM-CNR), National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR), Physique de la Matière Condensée (PMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), European Synchrotron Radiation Facility (ESRF), Consiglio Nazionale delle Ricerche (CNR), and Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)

Subjects
[PHYS.COND.CM-S]Physics [physics]/Condensed Matter [cond-mat]/Superconductivity [cond-mat.supr-con], Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Superconductivity, Condensed Matter::Superconductivity, 74.72.Bk, 74.25.Kc, 78.70.Ck, phonons, X-ray scattering, [PHYS.COND.CM-SCE]Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el], Y-based cuprates
Abstract

International audience; High-resolution ($\Delta E$=1.3 meV) inelastic X-ray scattering (IXS) in optimally doped untwinned YBa$_2$Cu$_3$O$_{7-\delta}$ single crystals show that the dispersion of transverse acoustic phonons in the a-direction remains linear with no softening due to bending modes in the long wavelength limit, down to q=0.02. The sound velocity is found to be 2700 +/- 70 m s$^{-1}$, in excellent agreement with ultrasound measurements, and unchanged upon cooling from room temperature to 98 K. These results rule out a strong coupling between bending dynamics of the CuO$_2$ planes and charge carriers in cuprates.

Published
2007
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12. In-plane copper-oxygen bond-stretching mode anomaly in underdoped La2−xSrxCuO4+ measured with high-resolution inelastic x-ray scattering

Author

Graf, Jeff, D'Astuto, Matteo, Giura, Paola, Shukla, Abhay, L. Saini, Naurang, Bossak, Alexei, Krisch, Michael, Cheong, Sang-Wook, Sasagawa, Takao, Lanzara, Alessandra, Materials Science Division [LBNL Berkeley], Lawrence Berkeley National Laboratory [Berkeley] (LBNL), Institut de minéralogie et de physique des milieux condensés (IMPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Dipartimento di Fisica, Università di Roma La Sapienza, Dipartimento di Fisica, European Synchrotron Radiation Facility (ESRF), Rutgers Center for Emergent Materials and Department of Physics & Astronomy, Okayama University, Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, and The University of Tokyo (UTokyo)

Subjects
[PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph], Condensed Matter::Superconductivity, PACS : 74.72.Dn, 63.20.Kr, 63.20.Dj, 74.25.Kc, Condensed Matter::Strongly Correlated Electrons
Abstract

International audience; We have measured the lattice dynamics of underdoped La2-xSrxCuO4+ x=0.08 using high resolution inelastic x-ray scattering spectroscopy. The very good intrinsic Q resolution of this experiment allows us to differentiate between the two proposed scenarios for the Cu-O bond stretching phonon broadening reported at q=0.25,0,0. The results suggest that this phonon broadening is due to intrinsic damping rather than to a steep dispersion, having important implications on the interpretation of phonon anomalies in cuprates.

Published
2007
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13. Magnetism under Pressure with Synchrotron Radiation

Author

D'Astuto, Matteo, Barla, Alessendro, Kernavanois, Nolwell, Rueff, Jean-Pascal, Baudelet, Francois, Ruffer, Rudolf, Paolasini, Luigi, Couzinet, Bernard, Institut de minéralogie et de physique des milieux condensés (IMPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Service de Physique Statistique, Magnétisme et Supraconductivité (SPSMS - UMR 9001), Institut Nanosciences et Cryogénie (INAC), Université Grenoble Alpes (UGA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), European Synchrotron Radiation Facility (ESRF), Institut Laue-Langevin (ILL), ILL, Laboratoire de Chimie Physique - Matière et Rayonnement (LCPMR), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Muséum national d'Histoire naturelle (MNHN)-Institut de recherche pour le développement [IRD] : UR206-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Département de Recherche Fondamentale sur la Matière Condensée (DRFMC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other]
Abstract

The magnetic properties of materials depend strongly on the distance between ions and on the volume available for each magnetic ion. In this article, we introduce a bird's eye view of the various possible effects of pressure on the magnetic state and the consequences of these effects on the fundamental understanding of the magnetism in condensed matter and on the physics and chemistry of minerals in the interior of the Earth and planets. We will give basic information about the ex- perimental possibilities offered by synchrotron-radiation-based techniques in order to explore the magnetic state of matter at high pressure, their interest and feasi- bility. Finally, we will present some experimental highlights where x-ray techniques using synchrotron radiation have been successfully applied to show and explain the magnetic state of matter at high density.

Published
2006

14. Phonon dispersion in 1-layer cuprate HgBa2CuO4+d

Author

D'Astuto, Matteo, Mirone, Alessandro, Giura, Paola, Colson, Dorothee, Forget, Anne, Krisch, Michael, European Synchrotron Radiation Facility (ESRF), Physique de la Matière Condensée (PMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Service de physique de l'état condensé (SPEC - UMR3680), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)

Subjects
Superconductivity (cond-mat.supr-con), [PHYS.COND.CM-S]Physics [physics]/Condensed Matter [cond-mat]/Superconductivity [cond-mat.supr-con], Condensed Matter - Strongly Correlated Electrons, Strongly Correlated Electrons (cond-mat.str-el), Condensed Matter - Superconductivity, inelastic X-ray scattering, 74.72.Jt, 74.25.Kc, 78.70.Ck, FOS: Physical sciences, Phonons, [PHYS.COND.CM-SCE]Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el], Hg-based cuprates
Abstract

We investigate the low energy acoustical and optical modes in $\mathrm{HgBa_2CuO_{4+\delta}}$ using inelastic x-ray scattering (IXS). The experimental phonon dispersion and the dynamical structure factor are compared with an atomic shell model, and the set of the atomic potentials obtained are discussed. Our results are also compared with those obtained by Raman spectroscopy and with density-of-state data measured by inelastic neutron scattering.

Published
2003

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