Evidence for Large Static and Dynamic Distortions in High Tc Superconducting YBa2Cu3O7−δ Crystals over a Wide Temperature Range
R. P. Sharma, T. Venkatesan, Z. H. Zhang, J. R. Liu, R. Chu, W. K. Chu
DOI 10.1103/PhysRevLett.77.4624 · Physical Review Letters
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Abstract
Large deviations from the expected atomic thermal vibrational amplitude in Cu-O rows in a YBa2Cu3O7−δ (Tc=92.5K) crystal have been observed in a wide temperature range (300–30 K) by ion channeling. In contrast, Y-Ba as well as Cu-O rows in nonsuperconducting deoxygenated YBa2Cu3O6.2 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92.5 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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