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1. Stability of the tetragonal phase of BaZrO3 under high pressure

Author

Toulouse, Constance, Amoroso, Danila, Oliva, Robert, Xin, Cong, Bouvier, Pierre, Fertey, Pierre, Veber, Philippe, Maglione, Mario, Ghosez, Philippe, Kreisel, Jens, and Guennou, Mael

Subjects
Condensed Matter - Materials Science
Abstract

In this paper, we revisit the high-pressure behavior of BaZrO3 by a combination of first-principle calculations, Raman spectroscopy, and x-ray diffraction under high pressure. We confirm experimentally the cubic-to-tetragonal transition at 10 GPa and find no evidence for any other phase transition up to 45 GPa, the highest pressures investigated, at variance with past reports. We re-investigate phase stability with density functional theory considering not only the known tetragonal (I4/mcm) phase but also other potential antiferrodistortive candidates. This shows that the tetragonal phase becomes progressively more stable upon increasing pressure as compared to phases with more complex tilt systems. The possibility for a second transition to another tilted phase at higher pressures, and in particular to the very common orthorhombic Pnma structure, is therefore ruled out.

Published
2022
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3. Role of Sb in the superconducting kagome metal CsV$_3$Sb$_5$ revealed by its anisotropic compression

Author

Tsirlin, Alexander A., Fertey, Pierre, Ortiz, Brenden R., Klis, Berina, Merkl, Valentino, Dressel, Martin, Wilson, Stephen D., and Uykur, Ece

Subjects
Condensed Matter - Superconductivity, Condensed Matter - Materials Science, Condensed Matter - Strongly Correlated Electrons
Abstract

Pressure evolution of the superconducting kagome metal CsV$_3$Sb$_5$ is studied with single-crystal x-ray diffraction and density-functional band-structure calculations. A highly anisotropic compression observed up to 5 GPa is ascribed to the fast shrinkage of the Cs-Sb distances and suppression of Cs rattling motion. This prevents Sb displacements required to stabilize the three-dimensional charge-density-wave (CDW) order and elucidates the disappearance of the CDW already at 2 GPa despite only minor changes in the electronic structure of the normal state. At higher pressures, vanadium bands still change only marginally, whereas antimony bands undergo a major reconstruction caused by the gradual formation of the interlayer Sb-Sb bonds. Our results exclude pressure tuning of vanadium kagome bands as the main mechanism for the non-trivial evolution of superconductivity in real-world kagome metals. Concurrently, we establish the central role of Sb atoms in the stabilization of a three-dimensional CDW and Fermi surface reconstruction., Comment: published version

Published
2021
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5. Time resolved photoemission spectroscopy of electronic cooling and localization in CH$_3$NH$_3$PbI$_3$ crystals

Author

Chen, Zhesheng, Lee, Min-i, Zhang, Zailan, Diab, Hiba, Garrot, Damien, Lédée, Ferdinand, Fertey, Pierre, Papalazarou, Evangelos, Marsi, Marino, Ponseca, Carlito, Deleporte, Emmanuelle, Tejeda, Antonio, and Perfetti, Luca

Subjects
Condensed Matter - Materials Science
Abstract

We measure the surface of CH$_3$NH$_3$PbI$_3$ single crystals by making use of two photon photoemission spectroscopy. Our method monitors the electronic distribution of photoexcited electrons, explicitly discriminating the initial thermalization from slower dynamical processes. The reported results disclose the fast dissipation channels of hot carriers (0.25 ps), set a upper bound to the surface induced recombination velocity ($<4000$ cm/s) and reveal the dramatic effect of shallow traps on the electrons dynamics. The picosecond localization of excited electrons in degraded CH$_3$NH$_3$PbI$_3$ samples is consistent with the progressive reduction of photoconversion efficiency in operating devices. Minimizing the density of shallow traps and solving the aging problem may boost the macroscopic efficiency of solar cells to the theoretical limit., Comment: 7 pages, 8 figures

Published
2017
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6. Giant Nernst effect in the incommensurate charge density wave state of P4W12O44

Author

Kolincio, Kamil K., Daou, Ramzy, Perez, Olivier, Guerin, Laurent, Fertey, Pierre, and Pautrat, Alain

Subjects
Condensed Matter - Strongly Correlated Electrons
Abstract

We report the study of Nernst effect in quasi-low dimensional tungsten bronze P4W12O44 showing a sequence of Peierls instabilities. We demonstrate that both condensation of the electronic carriers in the CDW state and the existence of high-mobility electrons and holes originating from the small pockets remaining in the incompletely nested Fermi surface give rise to a Nernst effect of a magnitude similar to that observed in heavy fermion compounds., Comment: Accepted to PRB

Published
2016
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8. Detailed investigation of the phase transition in K$_{x}$P$_4$W$_{8}$O$_{32}$ and experimental arguments for a charge density wave due to hidden nesting

Author

Kolincio, Kamil K., Pérez, Olivier, Hébert, Sylvie, Fertey, Pierre, and Pautrat, Alain

Subjects
Condensed Matter - Strongly Correlated Electrons
Abstract

Detailed structural and magnetotransport properties of the monophosphate tungsten bronze K$_{x}$P$_4$W$_{8}$O$_{32}$ single crystals are reported. Both galvanomagnetic and thermal properties are shown to be consistent with a charge density wave electronic transition due to hidden nesting of quasi - 1D portion of the Fermi surface. We also observe the enhancement of electronic anisotropy due to reconstruction of the Fermi surface at the Peierls transition. The resistivity presents a thermal hysteresis suggesting a first order nature characteristics of a strong coupling scenario. However, other measurements such as the change of carriers density demonstrate a second order Peierls scenario with weak coupling features. We suggest that the structural transition driven by the residual strain in the K - P - O environment is responsible for the resistivity hysteresis and modifes the Fermi surface which then helps the rise to the second order Peierls instability., Comment: Accepted to PRB

Published
2016
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9. Charge order and suppression of superconductivity in HgBa2CuO4 at high pressures

Author

Izquierdo, Manuel, Freitas, Daniele C., Colson, Dorothée, Garbarino, Gastón, Forget, Anne, Megtert, Stephan, Raffy, Helène, Comes, Robert, Itié, Jean-Paul, Ravy, Sylvain, Fertey, Pierre, and Núñez-Regueiro, Manuel

Subjects
Condensed Matter - Superconductivity
Abstract

New insight into the superconducting properties of HgBa2CuO4 (Hg-1201) cuprates is provided by combined measurements of the electrical resistivity and single crystal X-ray diffraction under pressure. The changes induced by increasing pressure up to 20GPa in optimally doped single crystals were investigated. The resistivity measurements as a function of temperature show a metallic behavior up to ~10GPa that gradually passes to an insulating state, typical of charge ordering, that totally suppresses superconductivity above 13GPa. The changes in resistivity are accompanied by the apparition of sharp Bragg peaks in the X-ray diffraction patterns indicating that the charge ordering is accompanied by a 3D oxygen ordering appearing at 10GPa of wavevector [0.25, 0, L]. As pressure induces a charge transfer of about 0.02 at 10GPa, our results are the first observation of charge order competing with superconductivity that develops in the over-doped region of the phase diagram of a cuprate., Comment: 9 pages, 3 figures

Published
2015

11. Reduced Tiara‐like Palladium Complex for Suzuki Cross Coupling Reactions

Author

Daka, Mario, primary, Montini, Tiziano, additional, Pengo, Paolo, additional, Marussi, Giovanna, additional, Crosera, Matteo, additional, Adami, Gianpiero, additional, Delgado, Juan Jose, additional, Giambastiani, Giuliano, additional, Fertey, Pierre, additional, Fonda, Emiliano, additional, Pasquato, Lucia, additional, and Fornasiero, Paolo, additional

Published
2023
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12. Composition-, Temperature- and Pressure-Induced Transitions between High-Pressure Stabilized Perovskite Phases of the (1-X)Bife0.5sc0.5o3 - Xlafe0.5sc0.5o3 Series

Author

Salak, Andrei N., primary, Cardoso, João P., additional, Khalyavin, Dmitry D., additional, Barbier, Antoine, additional, Fertey, Pierre, additional, Mikhalev, Sergey M., additional, Olekhnovich, Nikolai M., additional, Pushkarev, Anatoly V., additional, Radyush, Yuriy V., additional, Stanulis, Andrius, additional, and Ramanauskas, Rimantas, additional

Published
2023
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14. Stability of the tetragonal phase of BaZrO3 under high pressure

Author

Toulouse, Constance, primary, Amoroso, Danila, additional, Oliva, Robert, additional, Xin, Cong, additional, Bouvier, Pierre, additional, Fertey, Pierre, additional, Veber, Philippe, additional, Maglione, Mario, additional, Ghosez, Philippe, additional, Kreisel, Jens, additional, and Guennou, Mael, additional

Published
2022
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15. Stability of the tetragonal phase of BaZrO3 under high pressure

Author

Innovative Training Networks (ITN) Marie Sklodowska-Curie Actions-European Joint Doctorate in Functional Material Research (EJDFunMat) [641640] [sponsor], F.R.S-FNRS [2.5020.1] [sponsor], Walloon Region [1117545] [sponsor], Fond National de Recherche Luxembourg through a PEARL Grant [FNR/P12/4853155/Kreisel] [sponsor], Toulouse, Constance, Amoroso, Danila, Oliva, Robert, Xin, Cong, Bouvier, Pierre, Fertey, Pierre, Veber, Philippe, Maglione, Mario, Ghosez, Philippe, Kreisel, Jens, Guennou, Mael, Innovative Training Networks (ITN) Marie Sklodowska-Curie Actions-European Joint Doctorate in Functional Material Research (EJDFunMat) [641640] [sponsor], F.R.S-FNRS [2.5020.1] [sponsor], Walloon Region [1117545] [sponsor], Fond National de Recherche Luxembourg through a PEARL Grant [FNR/P12/4853155/Kreisel] [sponsor], Toulouse, Constance, Amoroso, Danila, Oliva, Robert, Xin, Cong, Bouvier, Pierre, Fertey, Pierre, Veber, Philippe, Maglione, Mario, Ghosez, Philippe, Kreisel, Jens, and Guennou, Mael

Abstract

In this paper, we revisit the high pressure behavior of BaZrO3 by a combination of first-principle calculations, Raman spectroscopy and x-ray diffraction under high pressure. We confirm experimentally the cubic-to -tetragonal transition at 10 GPa and find no evidence for any other phase transition up to 45 GPa, the highest pressures investigated, at variance with past reports. We reinvestigate phase stability with density functional theory considering not only the known tetragonal (I4/mcm) phase but also other potential antiferrodistortive candidates. This shows that the tetragonal phase becomes progressively more stable upon increasing pressure as compared to phases with more complex tilt systems. The possibility for a second transition to another tilted phase at higher pressures, and in particular to the very common orthorhombic Pnma structure, is therefore ruled out.

Published
2022

20. Patterning enhanced tetragonality in BiFeO3 thin films with effective negative pressure by helium implantation

Author

Toulouse, Constance, Fischer, Johanna, Farokhipoor, Saeedeh, Yedra, Lluis, Carlà, Francesco, Jarnac, Amélie, Elkaim, Erik, Fertey, Pierre, Audinot, Jean-Nicolas, Wirtz, Tom, Noheda, Beatriz, Garcia, Vincent, Fusil, Stéphane, Peral Alonso, Inmaculada, Guennou, Mael, Kreisel, Jens, Toulouse, Constance, Fischer, Johanna, Farokhipoor, Saeedeh, Yedra, Lluis, Carlà, Francesco, Jarnac, Amélie, Elkaim, Erik, Fertey, Pierre, Audinot, Jean-Nicolas, Wirtz, Tom, Noheda, Beatriz, Garcia, Vincent, Fusil, Stéphane, Peral Alonso, Inmaculada, Guennou, Mael, and Kreisel, Jens

Abstract

Helium implantation in epitaxial thin films is a way to control the out-of-plane deformation independently from the in-plane strain controlled by epitaxy. In particular, implantation by means of a helium microscope allows for local implantation and patterning down to the nanometer resolution, which is of interest for device applications. We present here a study of bismuth ferrite (BiFeO3) films where strain was patterned locally by helium implantation. Our combined Raman, x-ray diffraction, and transmission electron microscopy (TEM) study shows that the implantation causes an elongation of the BiFeO3 unit cell and ultimately a transition towards the so-called supertetragonal polymorph via states with mixed phases. In addition, TEM reveals the onset of amorphization at a threshold dose that does not seem to impede the overall increase in tetragonality. The phase transition from the R-like to T-like BiFeO3 appears as first-order in character, with regions of phase coexistence and abrupt changes in lattice parameters.

Published
2021

21. New insights about the structural properties of κ-(BEDT-TTF)2X2(CN)3 (X=Cu and Ag) Spin Liquids

Author

Foury-Leylekian, Pascale, Ilakovac, Vita, Fertey, Pierre, Balédent, Victor, Milat, Ognjen, Miyagawa, Kazuya, Kanoda, Kazushi, Hiramatsu, Takaaki, Yoshida, Yukihiro, Saito, Gunzi, Alemany i Cahner, Pere, Canadell, Enric, 1950, Tomic, Silvia, and Pouget, Jean-Paul

Subjects
Centrifugació, Condensed Matter::Strongly Correlated Electrons, Centrifugation, Liquids, X-rays diffraction, Difracció de raigs X, Líquids
Abstract

Here, the first accurate study is presented of the room-temperature and 100 K structures of one of the first organic spin liquids, 􏰗-(BEDT-TTF)2Ag2(CN)3. It is shown that the monoclinic structure determined previously is only the average one. It is shown that the exact structure presents triclinic symmetry with two non-equivalent dimers in the unit cell. But surprisingly this does not lead to a sizeable charge disproportionation between dimers. The difference from the analogue compound 􏰗-(BEDT-TTF)2Cu2(CN)3 which also presents a spin liquid phase is discussed in detail. The data provided here show the importance of the anionic layer and in particular the transition metal position in the process of symmetry breaking. The possible impact of the symmetry breaking, albeit weak, on the spin-liquid mechanism and the influence of various disorders on the physical properties of this system is also discussed.

Published
2020

22. New insights into the structural properties of j-(BEDT-TTF)2Ag2(CN)3 spin liquid

Author

Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Economía y Competitividad (España), Generalitat de Catalunya, Japan Society for the Promotion of Science, Foury-Leylekian, Pascale, Ilakovac, Vita, Fertey, Pierre, Baledent, Victor, Milat, Ognjen, Miyagawa, Kazuya, Kanoda, Kazushi, Hiramatsu, Takaaki, Yoshida, Yukihiro, Saito, Gunzi, Alemany, Pere, Canadell, Enric, Tomic, Silvia, Pouget, Jean-Paul, Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Economía y Competitividad (España), Generalitat de Catalunya, Japan Society for the Promotion of Science, Foury-Leylekian, Pascale, Ilakovac, Vita, Fertey, Pierre, Baledent, Victor, Milat, Ognjen, Miyagawa, Kazuya, Kanoda, Kazushi, Hiramatsu, Takaaki, Yoshida, Yukihiro, Saito, Gunzi, Alemany, Pere, Canadell, Enric, Tomic, Silvia, and Pouget, Jean-Paul

Abstract

Here, the first accurate study is presented of the room-temperature and 100 K structures of one of the first organic spin liquids, -(BEDT-TTF)2Ag2(CN)3. It is shown that the monoclinic structure determined previously is only the average one. It is shown that the exact structure presents triclinic symmetry with two non-equivalent dimers in the unit cell. But surprisingly this does not lead to a sizeable charge disproportionation between dimers. The difference from the analogue compound -(BEDT-TTF)2Cu2(CN)3 which also presents a spin liquid phase is discussed in detail. The data provided here show the importance of the anionic layer and in particular the transition metal position in the process of symmetry breaking. The possible impact of the symmetry breaking, albeit weak, on the spin-liquid mechanism and the influence of various disorders on the physical properties of this system is also discussed.

Published
2020

24. New insights into the structural properties of κ-(BEDT-TTF)2Ag2(CN)3spin liquid

Author

Foury-Leylekian, Pascale, primary, Ilakovac, Vita, additional, Fertey, Pierre, additional, Baledent, Victor, additional, Milat, Ognjen, additional, Miyagawa, Kazuya, additional, Kanoda, Kazushi, additional, Hiramatsu, Takaaki, additional, Yoshida, Yukihiro, additional, Saito, Gunzi, additional, Alemany, Pere, additional, Canadell, Enric, additional, Tomic, Silvia, additional, and Pouget, Jean-Paul, additional

Published
2020
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27. First pump–probe–probe hard X-ray diffraction experiments with a 2D hybrid pixel detector developed at the SOLEIL synchrotron

Author

Bachiller-Perea, Diana, primary, Abiven, Yves-Marie, additional, Bisou, Jérôme, additional, Fertey, Pierre, additional, Grybos, Pawel, additional, Jarnac, Amélie, additional, Kanouté, Brahim, additional, Koziol, Anna, additional, Langlois, Florent, additional, Laulhé, Claire, additional, Legrand, Fabien, additional, Maj, Piotr, additional, Menneglier, Claude, additional, Noureddine, Arafat, additional, Orsini, Fabienne, additional, Thibaux, Gauthier, additional, and Dawiec, Arkadiusz, additional

Published
2020
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28. Charge Order and Suppression of Superconductivity in HgBa2CuO4+d at High Pressures.

Author

Izquierdo, Manuel, Freitas, Daniele C., Colson, Dorothée, Garbarino, Gastón, Forget, Anne, Raffy, Helène, Itié, Jean-Paul, Ravy, Sylvain, Fertey, Pierre, and Núñez-Regueiro, Manuel

Subjects
SUPERCONDUCTING composites, ELECTRICAL resistivity, X-ray diffraction, SUPERCONDUCTIVITY, BRAGG gratings
Abstract

New insight into the superconducting properties of HgBa2CuO4 (Hg-1201) cuprates is provided by combined measurements of electrical resistivity and single crystal X-ray diffraction under pressure. The changes induced by increasing pressure up to 20 GPa in optimally doped single crystals were investigated. The resistivity measurements as a function of temperature show a metallic behavior up to ~10 GPa that gradually passes into an insulating state, typical of charge ordering, which totally suppresses superconductivity above 13 GPa. The changes in resistivity are accompanied by the apparition of sharp Bragg peaks in the X-ray diffraction patterns, indicating that the charge ordering is accompanied by a 3D oxygen ordering. Considering that pressure induces a charge transfer of about 0.02 at 10 GPa, our results are the first observation of charge order competing with superconductivity developed in the overdoped region of the phase diagram of a Hg-based cuprat [ABSTRACT FROM AUTHOR]

Published
2021
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29. Water Molecules Gating a Photoinduced One Electron Two Protons Transfer in a Tyr/His model of Photosystem II

Author

Chararalambidis, Georgios, Das, Syamal, Trapali, Adelais, Quaranta, Annamaria, Orio, Maylis, Halime, Zakaria, Fertey, Pierre, Guillot, Régis, Coutsolelos, Athanassios, Leibl, Winfried, Aukauloo, Ally, Sircoglou, Marie, Institut de Biologie Intégrative de la Cellule (I2BC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Photocatalyse et Biohydrogène (LPB), Département Biochimie, Biophysique et Biologie Structurale (B3S), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Biologie Intégrative de la Cellule (I2BC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences Moléculaires de Marseille (ISM2), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Institut de Chimie du CNRS (INC)-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), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Laboratory of Bioinorganic Chemistry, Department of Chemistry [Heraklion], University of Crete [Heraklion] (UOC)-University of Crete [Heraklion] (UOC), Laboratoire des Mécanismes fondamentaux de la Bioénergétique (LMB), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)

Subjects
artificial photosynthesis, [SDV]Life Sciences [q-bio], TyrZ-His190 model, Proton Coupled Electron Transfer
Abstract

International audience; In this report, we investigate on a biomimetic model of a H-bonded TyrZ/His190 pair covalently attached to a porphyrin sensitizer. Laser flash photolysis in presence of an external electron acceptor reveals the need of water molecules to unlock the light-induced oxidation of the phenol through an intramolecular pathway. Kinetics monitoring encompasses two fast phases with distinct spectral properties. The first phase is related to one-electron transfer from the phenol to the porphyrin radical cation coupled with a domino two-proton transfer leading to the ejection of a proton from the imidazole-phenol pair. The second phase concerns the convoy of the released proton to the porphyrin N4 coordinating cavity. Importantly, our study provides an unprecedented example of light induced electron transfer process in a TyrZ/His190 model of Photosystem II, evidencing the movement of both the phenol and imidazole protons along an isoenergetic pathway.

Published
2018

35. Time-resolved photoemission spectroscopy of electronic cooling and localization in CH$_3$ NH$_3$ PbI$_3$ crystals

Author

Chen, Zhesheng, Lee, Min-I, Zhang, Zailan, Diab, Hiba, Garrot, Damien, Lédée, Ferdinand, Fertey, Pierre, Papalazarou, Evangelos, Marsi, Marino, ponseca, carlito, Deleporte, Emmanuelle, Tejeda, Antonio, Perfetti, Luca, Laboratoire des Solides Irradiés (LSI), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Solides (LPS), Université Paris-Saclay-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), Laboratoire Aimé Cotton (LAC), Groupe d'Etude de la Matière Condensée (GEMAC), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Photophysique et Photochimie Supramoléculaires et Macromoléculaires (PPSM), École normale supérieure - Cachan (ENS Cachan)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Lund University [Lund], We also thanks dim-nanoK for funding under project ’PIED’, the DIM-Oximore and the Ecole Polytechnique for funding under the project ’ECOGAN’, European Project: 687008,H2020,H2020-FETOPEN-2014-2015-RIA,GOTSolar(2016), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)

Subjects
Condensed Matter - Materials Science, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]
Abstract

We measure the surface of CH$_3$NH$_3$PbI$_3$ single crystals by making use of two photon photoemission spectroscopy. Our method monitors the electronic distribution of photoexcited electrons, explicitly discriminating the initial thermalization from slower dynamical processes. The reported results disclose the fast dissipation channels of hot carriers (0.25 ps), set a upper bound to the surface induced recombination velocity ($, 7 pages, 8 figures

Published
2017

36. New insights into the structural properties of κ‐(BEDT‐TTF)2Ag2(CN)3 spin liquid.

Author

Foury-Leylekian, Pascale, Ilakovac, Vita, Fertey, Pierre, Baledent, Victor, Milat, Ognjen, Miyagawa, Kazuya, Kanoda, Kazushi, Hiramatsu, Takaaki, Yoshida, Yukihiro, Saito, Gunzi, Alemany, Pere, Canadell, Enric, Tomic, Silvia, and Pouget, Jean-Paul

Subjects
SYMMETRY breaking, UNIT cell, TRANSITION metals, METAL-insulator transitions, DIMERS
Abstract

Here, the first accurate study is presented of the room‐temperature and 100 K structures of one of the first organic spin liquids, κ‐(BEDT‐TTF)2Ag2(CN)3. It is shown that the monoclinic structure determined previously is only the average one. It is shown that the exact structure presents triclinic symmetry with two non‐equivalent dimers in the unit cell. But surprisingly this does not lead to a sizeable charge disproportionation between dimers. The difference from the analogue compound κ‐(BEDT‐TTF)2Cu2(CN)3 which also presents a spin liquid phase is discussed in detail. The data provided here show the importance of the anionic layer and in particular the transition metal position in the process of symmetry breaking. The possible impact of the symmetry breaking, albeit weak, on the spin‐liquid mechanism and the influence of various disorders on the physical properties of this system is also discussed. [ABSTRACT FROM AUTHOR]

Published
2020
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38. Diterpenoids from Euphorbia dulcis with Potassium Ion Channel Inhibitory Activity with Selective G Protein-Activated Inwardly Rectifying Ion Channel (GIRK) Blocking Effect

Author

Kúsz, Norbert, primary, Orvos, Péter, additional, Bereczki, Laura, additional, Fertey, Pierre, additional, Bombicz, Petra, additional, Csorba, Attila, additional, Tálosi, László, additional, Jakab, Gusztáv, additional, Hohmann, Judit, additional, and Rédei, Dóra, additional

Published
2018
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40. Water Molecules Gating a Photoinduced One-Electron Two-Protons Transfer in a Tyrosine/Histidine (Tyr/His) Model of Photosystem II

Author

Chararalambidis, Georgios, primary, Das, Shyamal, additional, Trapali, Adelais, additional, Quaranta, Annamaria, additional, Orio, Maylis, additional, Halime, Zakaria, additional, Fertey, Pierre, additional, Guillot, Régis, additional, Coutsolelos, Athanassios, additional, Leibl, Winfried, additional, Aukauloo, Ally, additional, and Sircoglou, Marie, additional

Published
2018
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41. (BEDT-TTF)2Cu2(CN)3 Spin Liquid: Beyond the Average Structure

Author

Foury-Leylekian, Pascale, primary, Ilakovac, Vita, additional, Balédent, Victor, additional, Fertey, Pierre, additional, Arakcheeva, Alla, additional, Milat, Ognjen, additional, Petermann, Denis, additional, Guillier, Gilles, additional, Miyagawa, Kazuya, additional, Kanoda, Kazushi, additional, Alemany, Pere, additional, Canadell, Enric, additional, Tomic, Silvia, additional, and Pouget, Jean-Paul, additional

Published
2018
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42. Commissioning of a multi-beamline femtoslicing facility at SOLEIL

Author

Labat, Marie, primary, Brubach, Jean-Blaise, additional, Ciavardini, Alessandra, additional, Couprie, Marie-Emmanuelle, additional, Elkaim, Erik, additional, Fertey, Pierre, additional, Ferte, Tom, additional, Hollander, Philippe, additional, Hubert, Nicolas, additional, Jal, Emmanuelle, additional, Laulhé, Claire, additional, Luning, Jan, additional, Marcouillé, Olivier, additional, Moreno, Thierry, additional, Morin, Paul, additional, Polack, Francois, additional, Prigent, Pascale, additional, Ravy, Sylvain, additional, Ricaud, Jean-Paul, additional, Roy, Pascale, additional, Silly, Mathieu, additional, Sirotti, Fausto, additional, Taleb, Amina, additional, Tordeux, Marie-Agnès, additional, and Nadji, Amor, additional

Published
2018
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44. Detailed investigation of the phase transition in Kx P4 W8 O32 and experimental arguments for a charge density wave due to hidden nesting

Author

Kolincio, Kamil K., Pérez, Olivier, Hébert, Sylvie, Fertey, Pierre, Pautrat, Alain, Laboratoire de cristallographie et sciences des matériaux (CRISMAT), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Gdańsk University of Technology (GUT), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), and Normandie Université (NU)-Institut de Chimie du CNRS (INC)

Subjects
Magnetic susceptibility, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, Condensed Matter - Strongly Correlated Electrons, Two-dimensional electron gas, Charge density waves, Strongly Correlated Electrons (cond-mat.str-el), Band gap, [CHIM.CRIS]Chemical Sciences/Cristallography, FOS: Physical sciences, [CHIM]Chemical Sciences, Condensed Matter::Strongly Correlated Electrons, [CHIM.MATE]Chemical Sciences/Material chemistry
Abstract

Detailed structural and magnetotransport properties of the monophosphate tungsten bronze K$_{x}$P$_4$W$_{8}$O$_{32}$ single crystals are reported. Both galvanomagnetic and thermal properties are shown to be consistent with a charge density wave electronic transition due to hidden nesting of quasi - 1D portion of the Fermi surface. We also observe the enhancement of electronic anisotropy due to reconstruction of the Fermi surface at the Peierls transition. The resistivity presents a thermal hysteresis suggesting a first order nature characteristics of a strong coupling scenario. However, other measurements such as the change of carriers density demonstrate a second order Peierls scenario with weak coupling features. We suggest that the structural transition driven by the residual strain in the K - P - O environment is responsible for the resistivity hysteresis and modifes the Fermi surface which then helps the rise to the second order Peierls instability., Comment: Accepted to PRB

Published
2016

45. Time-resolved photoemission spectroscopy of electronic cooling and localization in CH3NH3PbI3 crystals

Author

Chen, Zhesheng, primary, Lee, Min-i, additional, Zhang, Zailan, additional, Diab, Hiba, additional, Garrot, Damien, additional, Lédée, Ferdinand, additional, Fertey, Pierre, additional, Papalazarou, Evangelos, additional, Marsi, Marino, additional, Ponseca, Carlito, additional, Deleporte, Emmanuelle, additional, Tejeda, Antonio, additional, and Perfetti, Luca, additional

Published
2017
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48. First determination of the valence band dispersion of CH3NH3PbI3hybrid organic–inorganic perovskite

Author

Lee, Min-I, primary, Barragán, Ana, additional, Nair, Maya N, additional, Jacques, Vincent L R, additional, Le Bolloc’h, David, additional, Fertey, Pierre, additional, Jemli, Khaoula, additional, Lédée, Ferdinand, additional, Trippé-Allard, Gaëlle, additional, Deleporte, Emmanuelle, additional, Taleb-Ibrahimi, Amina, additional, and Tejeda, Antonio, additional

Published
2017
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50. Crystal structure dependent in vitro antioxidant activity of biocompatible calcium gallate MOFs

Author

Hidalgo, Tania, primary, Cooper, Lucy, additional, Gorman, Martin, additional, Lozano-Fernández, Tamara, additional, Simón-Vázquez, Rosana, additional, Mouchaham, Georges, additional, Marrot, Jérome, additional, Guillou, Nathalie, additional, Serre, Christian, additional, Fertey, Pierre, additional, González-Fernández, África, additional, Devic, Thomas, additional, and Horcajada, Patricia, additional

Published
2017
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