Local lattice distortions and dynamics in extremely overdoped superconducting YSr 2 Cu 2.75 Mo 0.25 O 7.54
| Autor: | Gianguido Baldinozzi, Changqing Jin, Maarit Karppinen, Jack Mingde Jiang, Matthew J. Latimer, Edmondo Gilioli, Oliver Mueller, Wenmin Li, Andrea Gauzzi, V. F. Nasretdinova, Lipeng Cao, Theodore H. Geballe, Steven D. Conradson |
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| Přispěvatelé: | Los Alamos National Laboratory (LANL), Stanford University, Department of Advanced Materials Science, The University of Tokyo (UTokyo), Department of Chemistry, Institute of Software Chinese Academy of Sciences [Beijing], Laboratoire Structures, Propriétés et Modélisation des solides (SPMS), Institut de Chimie du CNRS (INC)-CentraleSupélec-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Istituto dei Materiali per l'Elettronica ed il Magnetismo [Genova] (IMEM-CNR), Consiglio Nazionale delle Ricerche (CNR), Stanford Synchrotron Radiation Lightsource (SSRL SLAC), SLAC National Accelerator Laboratory (SLAC), Stanford University-Stanford University, University of Ljubljana, J. Stefan Institute, CNRS, Inorganic Materials Chemistry, Chinese Academy of Sciences, Université Paris-Saclay, National Research Council of Italy, United States Department of Energy, Center of Excellence on Nanoscience and Nanotechnology - Nanocenter, Department of Chemistry and Materials Science, Aalto-yliopisto, Aalto University |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
02 engineering and technology Crystal structure 01 natural sciences symbols.namesake Cuprates 0103 physical sciences [CHIM.CRIS]Chemical Sciences/Cristallography Cuprate 010306 general physics Multidisciplinary Valence (chemistry) Condensed matter physics High-pressure oxygen Fermi level Overdoped Fermi surface [CHIM.MATE]Chemical Sciences/Material chemistry 021001 nanoscience & nanotechnology XANES X-ray absorption fine structure Local structure symbols [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] Fermi liquid theory [PHYS.COND.CM-SCE]Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el] 0210 nano-technology [CHIM.RADIO]Chemical Sciences/Radiochemistry |
| Zdroj: | Proceedings of the National Academy of Sciences of the United States of America Proceedings of the National Academy of Sciences of the United States of America, National Academy of Sciences, 2020, 117, pp.4559-4564. ⟨10.1073/pnas.1918704117⟩ |
| ISSN: | 0027-8424 1091-6490 |
| DOI: | 10.1073/pnas.1918704117⟩ |
| Popis: | International audience; A common characteristic of many "overdoped" cuprates prepared with high-pressure oxygen is T c values ≥ 50 K that often exceed that of optimally doped parent compounds, despite O stoichiome-tries that place the materials at the edge or outside of the conventional boundary between superconducting and normal Fermi liquid states. X-ray absorption fine-structure (XAFS) measurements at 52 K on samples of high-pressure oxygen (HPO) YSr 2 Cu 2.75 Mo 0.25 O 7.54 , T c = 84 K show that the Mo is in the (VI) valence in an unusually undistorted octahedral geometry with predominantly Mo neighbors that is consistent with its assigned substitution for Cu in the chain sites of the structure. Perturbations of the Cu environments are minimal, although the Cu X-ray absorption near-edge structure (XANES) differs from that in other cuprates. The primary deviation from the crystal structure is therefore nanophase separation into Mo-and Cu-enriched domains. There are, however, indications that the dynamical attributes of the structure are altered relative to YBa 2 Cu 3 O 7 , including a shift of the Cu-apical O two-site distribution from the chain to the plane Cu sites. Another effect that would influence T c is the possibility of multiple bands at the Fermi surface caused by the presence of the second phase and the lowering of the Fermi level. |
| Databáze: | OpenAIRE |
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