Composition-dependent superconductivity in La2−xSrxCuO4−δ
R. B. van Dover, R. J. Cava, B. Batlogg, E. A. Rietman
DOI 10.1103/PhysRevB.35.5337 · Physical Review B
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Abstract
We report the dependence of the superconducting critical temperature on x for a series of La2−xSrxCuO4−δ samples prepared under identical conditions. A strong peak in the fraction of the sample which is superconducting occurs near x=0.15, the composition which also gives the highest transition temperatures as measured by resistivity and the dc Meissner effect. Relatively high onset temperatures are observed, and we infer the presence of another, possibly metastable, material with a critical temperature substantially higher than that of bulk K2NiF4 structure-type La2−xSrxCuO4−δ.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xSrxCuO4-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37.5 | Pressure not reported | midpoint |
| La2-xSrxCuO4-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37.5 | Pressure not reported | onset |
| La1.8Sr0.2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38.5 | Pressure not reported | onset |
| La1.8Sr0.2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35.5 | Pressure not reported | zero_resistance |
| La1.8Sr0.2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 36 | Pressure not reported | onset |
| La2-xBaxCuO4-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | midpoint |
| La2-xBaxCuO4-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28 | Pressure not reported | onset |
| La1.925Sr0.075CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 52 | Pressure not reported | onset |
| La1.85Sr0.15CuO4 Archive — disputed claim Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 70 | Pressure not reported | onset |
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