Evidence for Large Static and Dynamic Distortions in High {ital t}{sub c} Superconducting YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital {delta}}} Crystals over a Wide Temperature Range

Journal Article · Fri Nov 01 04:00:00 EST 1996 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.77.4624· OSTI ID:402522

Sharma, R; Venkatesan, T ^[1]; Zhang, Z; Liu, J; Chu, R; Chu, W ^[2]

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1. Center for Superconductivity Research, University of Maryland, College Park, Maryland 20742 (United States)
2. Texas Center for Superconductivity, University of Houston, Houston, Texas 77204 (United States)

Large deviations from the expected atomic thermal vibrational amplitude in Cu-O rows in a YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} ({ital T}{sub {ital c}}=92.5 K) crystal have been observed in a wide temperature range (300{endash}30K) by ion channeling. In contrast, Y-Ba as well as Cu-O rows in nonsuperconducting deoxygenated YBa{sub 2}Cu{sub 3}O{sub 6.2} specimens show a normal decrease in the atomic vibrational amplitude as the sample temperature is lowered. These anomalous results in the YBCO superconductor provide a clear indication of uncorrelated static and dynamic distortions associated with Cu-O rows. Possible implications of these structural changes are discussed. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 402522
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 22 Vol. 77; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ATOMIC DISPLACEMENTS
BARIUM OXIDES
COPPER OXIDES
DISPLACEMENTS
HIGH-TC SUPERCONDUCTORS
ION CHANNELING
LATTICE VIBRATIONS
PHONONS
TEMPERATURE DEPENDENCE
YTTRIUM OXIDES