Local structure of Sr2CuO3.3, a 95 K cuprate superconductor without CuO2 planes
- Jozef Stefan Inst., Ljubljana (Slovenia); Washington State Univ., Pullman, WA (United States)
- Stanford Univ., CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Chinese Academy of Sciences (CAS), Beijing (China); Materials Research Lab. at Songshan Lake, Dongguan (China)
- Chinese Academy of Sciences (CAS), Beijing (China)
- CNRS CentraleSupélec Univ. Paris-Saclay, Gif-sur-Yvette (France)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
The local structure of the highly “overdoped” 95 K superconductor Sr2CuO3.3 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 CuO2 planes, magnetization along thecaxis, and a termination of the superconductivity when the excess charge on the CuO2Cu ions exceeds 0.27. Here, 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 CuO2 planes while retaining exceptionally high transition temperatures.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Organization:
- 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
- Grant/Contract Number:
- 1928874; P1-0040; 2018YFA03057001; 2017YFA0302901; 11820101003; 2016YFA0300301; 2015CB921000; 112111KYS820150017; AC02-76SF00515
- OSTI ID:
- 1599910
- Alternate ID(s):
- OSTI ID: 1608342
- Journal Information:
- Proceedings of the National Academy of Sciences of the United States of America, Vol. 117, Issue 9; ISSN 0027-8424
- Publisher:
- National Academy of SciencesCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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