Anomalous Disappearance of High-Tc Superconductivity at High Hole Concentration in Metallic La2−xSrxCuO4
J. B. Torrance, Y. Tokura, A. I. Nazzal, A. Bezinge, T. C. Huang, S. S. P. Parkin
DOI 10.1103/PhysRevLett.61.1127 · Physical Review Letters
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Abstract
Samples of La2−xSrxCuO4−δ have previously shown a maximum concentration of p=0.15 holes per [CuO2] unit, because increasing x>0.15 normally induces compensating oxygen vacancies. Annealing samples in 100 bars of oxygen pressure fills the oxygen vacancies and greatly increases the range of accessible hole concentrations, up to p=0.40 (or effectively Cu+2.40). We find that Tc is constant at ≃36 K from p=0.15 to 0.24, where it begins to decrease. Beyond p≃0.32, superconductivity disappears, even though the samples are more conducting.
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. | 36 | Pressure not reported | onset |
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