Pressure dependence of the superconducting transition temperature of superoxygenated La2CuO4+δ
J. E. Schirber, W. R. Bayless, F. C. Chou, D. C. Johnston, P. C. Canfield, Z. Fisk
DOI 10.1103/PhysRevB.48.6506 · Physical Review B
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Abstract
We report the pressure dependence of the superconducting transition temperatures (Tc) of two phases of superoxygenated La2CuO4+δ prepared by both high-pressure and electrochemical charging with oxygen. The results are strikingly different from those observed in La1.85Sr0.15CuO4, which has a similar maximum value for Tc. The results are discussed in the framework of a model in which a positive contribution to the pressure derivative ubiquitous to the copper oxide superconductors is canceled to varying degree by a negative derivative due to charge transfer associated with oxygen mobility which depends upon the temperature at which the pressure is applied.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 43 | Pressure unresolved | onset |
| La2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure unresolved | onset |
| La2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure unresolved | onset |
| La2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28 | Pressure unresolved | onset |
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38 | Pressure not reported | unknown |
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