Variation of the ab-plane normal-state resistance and the superconducting transition temperature of a YBa2Cu3O7−δ single crystal to pressures of 13 GPa
S. W. Tozer, J. L. Koston, E. M. McCarron III
DOI 10.1103/PhysRevB.47.8089 · Physical Review B
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Abstract
The temperature-dependent dc electrical resistance of the ab plane of a twinned YBa2Cu3O7−δ single crystal with an ambient pressure Tc(50%)∼90 K [ΔTc(10–90 %)∼350 mK] has been studied to 13.2 GPa. The initial rate of increase in the critical temperature to pressures of approximately 6 GPa is 0.64 K/GPa. To the highest pressures, the linear slope of dRab/dT within the ab plane decreases wi th increasing pressure, as does the residual resistance even as the critical temperature passes through a maximum at 95.2 K and 11.3 GPa. Comparison with the pressure data of Klotz, Reith, and Schilling [Physica C 172, 423 (1991)] for an apparently equivalent crystal requires that the singular importance of the carrier concentration in the planes as that factor which solely determines Tc be readdressed.
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. | 90 | Pressure unresolved | midpoint |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 95.2 | 11.3 GPa | unknown |
| YBa2Cu4O8 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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