Time-dependent Meissner fraction as a function of aging in an oxygen-deficient YBa2Cu3O7−δ single crystal
K. G. Vandervoort, G. W. Crabtree, Y. Fang, S. Yang, H. Claus, J. W. Downey
DOI 10.1103/PhysRevB.43.3688 · Physical Review B
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Abstract
Meissner- and shielding-effect measurements were made on an oxygen-deficient single crystal of YBa2Cu3O7−δ as a function of aging time at room temperature following a quench from 225 °C. It is seen that the Meissner fraction systematically increases from 11.1% to 13.2% as Tc changes from 11.2 to 25.0 K. All aging was done within the helium exchange gas environment of the sample chamber. The results point to oxygen vacancy ordering rather than oxygen absorption as the mechanism for both the Tc and Meissner-fraction increase.
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. | 11.2 | Pressure unresolved | onset |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure unresolved | onset |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure unresolved | onset |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26.1 | Pressure unresolved | onset |
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