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Title: Local lattice distortions and dynamics in extremely overdoped superconducting YSr 2 Cu 2.75 Mo 0.25 O 7.54

Abstract

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 stoichiometries 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 more » 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.« less

Authors:
; ; ; ; ; ORCiD logo; ; ; ; ; ; ; ORCiD logo
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1600088
Grant/Contract Number:  
[AC02-76SF00515; 2018YFA03057001; 2017YFA0302901; 11820101003; 2016YFA0300301; 2015CB921000; and 112111KYS820150017; DEAC02-76SF00515]
Resource Type:
Published Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
[Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Volume: 117 Journal Issue: 9]; Journal ID: ISSN 0027-8424
Publisher:
Proceedings of the National Academy of Sciences
Country of Publication:
United States
Language:
English

Citation Formats

Conradson, Steven D., Geballe, Theodore H., Gauzzi, Andrea, Karppinen, Maarit, Jin, Changqing, Baldinozzi, Gianguido, Li, Wenmin, Cao, Lipeng, Gilioli, Edmondo, Jiang, Jack M., Latimer, Matthew, Mueller, Oliver, and Nasretdinova, Venera. Local lattice distortions and dynamics in extremely overdoped superconducting YSr 2 Cu 2.75 Mo 0.25 O 7.54. United States: N. p., 2020. Web. doi:10.1073/pnas.1918704117.
Conradson, Steven D., Geballe, Theodore H., Gauzzi, Andrea, Karppinen, Maarit, Jin, Changqing, Baldinozzi, Gianguido, Li, Wenmin, Cao, Lipeng, Gilioli, Edmondo, Jiang, Jack M., Latimer, Matthew, Mueller, Oliver, & Nasretdinova, Venera. Local lattice distortions and dynamics in extremely overdoped superconducting YSr 2 Cu 2.75 Mo 0.25 O 7.54. United States. doi:10.1073/pnas.1918704117.
Conradson, Steven D., Geballe, Theodore H., Gauzzi, Andrea, Karppinen, Maarit, Jin, Changqing, Baldinozzi, Gianguido, Li, Wenmin, Cao, Lipeng, Gilioli, Edmondo, Jiang, Jack M., Latimer, Matthew, Mueller, Oliver, and Nasretdinova, Venera. Tue . "Local lattice distortions and dynamics in extremely overdoped superconducting YSr 2 Cu 2.75 Mo 0.25 O 7.54". United States. doi:10.1073/pnas.1918704117.
@article{osti_1600088,
title = {Local lattice distortions and dynamics in extremely overdoped superconducting YSr 2 Cu 2.75 Mo 0.25 O 7.54},
author = {Conradson, Steven D. and Geballe, Theodore H. and Gauzzi, Andrea and Karppinen, Maarit and Jin, Changqing and Baldinozzi, Gianguido and Li, Wenmin and Cao, Lipeng and Gilioli, Edmondo and Jiang, Jack M. and Latimer, Matthew and Mueller, Oliver and Nasretdinova, Venera},
abstractNote = {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 stoichiometries 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.},
doi = {10.1073/pnas.1918704117},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = [9],
volume = [117],
place = {United States},
year = {2020},
month = {2}
}

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