Bulk superconductivity above 30 K in T/emph>-phase compounds
M. F. Hundley, J. D. Thompson, S-W. Cheong, Z. Fisk, R. B. Schwarz, J. E. Schirber
DOI 10.1103/PhysRevB.40.5251 · Physical Review B
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Abstract
High-pressure (3 kbar) oxygenation of (La, Sm, Sr)2CuO4 compounds having the T* structure leads to bulk superconducting transitions above 30 K and the appearance of a diamagnetic response at temperatures as high as ∼37 K. With increasing oxygenation pressure, the electrical resistivity and thermoelectric power progress from hoppinglike to more nearly metalliclike transport. The similarity in Tc and transport character with those of T-phase La2−xSrxCuO4, despite significant structural differences, further constrains possible mechanisms for superconductivity in the cuprates.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La0.82Sm1.0Sr0.18CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | onset |
| La0.82Sm1.0Sr0.18CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37 | Pressure not reported | onset |
| La0.82Sm1.0Sr0.18CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 21 | Pressure not reported | onset |
| Nd.32Ceo.27Sro.41CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23 | Pressure not reported | unknown |
| La1.40Smo.40Sro.2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 33 | Pressure not reported | onset |
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