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Title: Local structure of Sr 2 CuO 3.3 , a 95 K cuprate superconductor without CuO 2 planes

Abstract

The local structure of the highly “overdoped” 95 K superconductor Sr 2 CuO 3.3 determined by Cu K X-ray absorption fine structure (XAFS) at 62 K in magnetically oriented samples shows that 1) the magnetization is perpendicular to the c axis; 2) at these levels of precision the Cu sublattice is tetragonal in agreement with the crystal structure; the O sublattice has 3) continuous -Cu-O- chains that orient perpendicular to an applied magnetic field; 4) approximately half-filled -Cu-O- chains that orient parallel to this field; 5) a substantial number of apical O vacancies; 6) O ions at some apical positions with expanded Cu-O distances; and 7) interstitial positions that imply highly displaced Sr ions. These results contradict the universally accepted features of cuprates that require intact CuO 2 planes, magnetization along the c axis, and a termination of the superconductivity when the excess charge on the CuO 2 Cu ions exceeds 0.27. These radical differences in charge and structure demonstrate that this compound constitutes a separate class of Cu-O–based superconductors in which the superconductivity originates in a different, more complicated structural unit than CuO 2 planes while retaining exceptionally high transition temperatures.

Authors:
; ; ; ; ORCiD logo; ; ;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Ministry of Science and Technology (MOST); National Natural Science Foundation (NSF) of China
OSTI Identifier:
1599910
Alternate Identifier(s):
OSTI ID: 1608342
Grant/Contract Number:  
1928874; P1-0040; 2018YFA03057001; 2017YFA0302901; 11820101003; 2016YFA0300301; 2015CB921000; 112111KYS820150017; AC02-76SF00515
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:
National Academy of Sciences
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; overdoped cuprate; CuO2 plane; high-temperature superconductivity; X-ray absorption fine structure spectroscopy

Citation Formats

Conradson, Steven D., Geballe, Theodore H., Jin, Changqing, Cao, Lipeng, Baldinozzi, Gianguido, Jiang, Jack M., Latimer, Matthew J., and Mueller, Oliver. Local structure of Sr 2 CuO 3.3 , a 95 K cuprate superconductor without CuO 2 planes. United States: N. p., 2020. Web. https://doi.org/10.1073/pnas.1918890117.
Conradson, Steven D., Geballe, Theodore H., Jin, Changqing, Cao, Lipeng, Baldinozzi, Gianguido, Jiang, Jack M., Latimer, Matthew J., & Mueller, Oliver. Local structure of Sr 2 CuO 3.3 , a 95 K cuprate superconductor without CuO 2 planes. United States. https://doi.org/10.1073/pnas.1918890117
Conradson, Steven D., Geballe, Theodore H., Jin, Changqing, Cao, Lipeng, Baldinozzi, Gianguido, Jiang, Jack M., Latimer, Matthew J., and Mueller, Oliver. Fri . "Local structure of Sr 2 CuO 3.3 , a 95 K cuprate superconductor without CuO 2 planes". United States. https://doi.org/10.1073/pnas.1918890117.
@article{osti_1599910,
title = {Local structure of Sr 2 CuO 3.3 , a 95 K cuprate superconductor without CuO 2 planes},
author = {Conradson, Steven D. and Geballe, Theodore H. and Jin, Changqing and Cao, Lipeng and Baldinozzi, Gianguido and Jiang, Jack M. and Latimer, Matthew J. and Mueller, Oliver},
abstractNote = {The local structure of the highly “overdoped” 95 K superconductor Sr 2 CuO 3.3 determined by Cu K X-ray absorption fine structure (XAFS) at 62 K in magnetically oriented samples shows that 1) the magnetization is perpendicular to the c axis; 2) at these levels of precision the Cu sublattice is tetragonal in agreement with the crystal structure; the O sublattice has 3) continuous -Cu-O- chains that orient perpendicular to an applied magnetic field; 4) approximately half-filled -Cu-O- chains that orient parallel to this field; 5) a substantial number of apical O vacancies; 6) O ions at some apical positions with expanded Cu-O distances; and 7) interstitial positions that imply highly displaced Sr ions. These results contradict the universally accepted features of cuprates that require intact CuO 2 planes, magnetization along the c axis, and a termination of the superconductivity when the excess charge on the CuO 2 Cu ions exceeds 0.27. These radical differences in charge and structure demonstrate that this compound constitutes a separate class of Cu-O–based superconductors in which the superconductivity originates in a different, more complicated structural unit than CuO 2 planes while retaining exceptionally high transition temperatures.},
doi = {10.1073/pnas.1918890117},
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}
}

Journal Article:
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https://doi.org/10.1073/pnas.1918890117

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