Local Cu and Br environments and their relationship to superconductivity restoration in brominated YBa{sub 2}Cu{sub 3}O{sub y}

Journal Article · Sat Aug 01 04:00:00 EDT 1998 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.122108· OSTI ID:641499

Potrepka, D M; Fenner, D B; Balasubramanian, M; Hines, W A; Budnick, J I ^[1]

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1. Department of Physics and Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269 (United States)

{sup 63,65}Cu nuclear quadrupole resonance (NQR) and Br {ital k}-edge x-ray absorption fine structure (XAFS) have been used to study the local structures in well-characterized samples of deoxygenated and brominated YBa{sub 2}Cu{sub 3}O{sub y}(YBCO). NQR shows that after bromination of YBa{sub 2}Cu{sub 3}O{sub 6.1} at 260thinsp{degree}C, oxygen has repopulated the chain sites. From XAFS, it is concluded that Br does not enter the YBCO lattice, but rather precipitates out as small nanoscale particles of BaBr{sub 2}. These results provide clear evidence of the role of Br in reoxygenating the YBCO structure and an explanation for the partial restoration of superconductivity in the YBCO system. {copyright} {ital 1998 American Institute of Physics.}

• OSTI ID: 641499
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 8 Vol. 73; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
ABSORPTION SPECTRA
BARIUM COMPOUNDS
BARIUM OXIDES
BROMINE
BROMINE ADDITIONS
COPPER 65
COPPER OXIDES
HIGH-TC SUPERCONDUCTORS
NUCLEAR QUADRUPOLE RESONANCE
PRECIPITATION
STRUCTURAL CHEMICAL ANALYSIS
X-RAY SPECTRA
YTTRIUM COMPOUNDS
YTTRIUM OXIDES