Comparison of the pressure dependencies of Tc in the 90-K superconductors RBa2Cu3Ox (R=Gd,Er,andYb) and YBa2Cu3Ox
H. A. Borges, R. Kwok, J. D. Thompson, G. L. Wells, J. L. Smith, Z. Fisk, D. E. Peterson
DOI 10.1103/PhysRevB.36.2404 · Physical Review B
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Abstract
We have determined the effect of pressure P on the resistance and superconducting transition temperature Tc of RBa2Cu3Ox (R=Gd,Er,andYb) and compare our results to those obtained on high-quality YBa2Cu3Ox. The transition temperature, which is 90 K or greater at ambient pressure for all four compounds, is enhanced by pressure in each at rates between 0.09 and 0.19 K/kbar. Interestingly, the presence of a localized moment in the rare-earth compounds appears to have no influence on the pressure response. From the positive dTcdP we infer a positive change in the thermal expansion upon entering the superconducting state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure unresolved | midpoint |
| GdBa2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure unresolved | midpoint |
| ErBa2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure unresolved | midpoint |
| YbBa2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure unresolved | midpoint |
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