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Local structure distortion in a YBa/sub 2-0. 52/Sr/sub 0. 52/Cu/sub 3/O/sub 7/ superconductor

Journal Article · · Phys. Rev. B: Condens. Matter; (United States)
X-ray-absorption fine structure has been used to study local structure distortions of a Sr-doped superconductor YBa/sub 2-//sub x/Sr/sub x/Cu/sub 3/O/sub 7-//sub delta/ with x = 0.52 and T/sub c/ = 95 K. Direct comparison with the undoped superconductor shows that the local structure around the Sr atoms, which are directly observed to substitute for Ba atoms, was found to be distorted significantly, with four oxygen atoms located at the Ba/Sr plane shifted towards Sr atoms by 0.14 A, and Sr shifted closer to the Cu(2) plane by 0.05 A. No significant changes are found for the local structures aroung Cu and Y atoms, which implies that the Cu(2) plane and CuO/sub 2/-Y-CuO/sub 2/ sandwich structure is preserved.
Research Organization:
Institute for Structural and Functional Studies, 3401 Market Street, Philadelphia, Pennsylvania 19104
OSTI ID:
6553473
Journal Information:
Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Journal Issue: 4 Vol. 39:4; ISSN PRBMD
Country of Publication:
United States
Language:
English