Superconductivity in La-deficient and stoichiometric La2CuO4
S. A. Shaheen, N. Jisrawi, Y. H. Lee, Y. Z. Zhang, M. Croft, W. L. McLean, H. Zhen, L. Rebelsky, S. Horn
DOI 10.1103/PhysRevB.36.7214 · Physical Review B
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Abstract
The effects of La deficiency and of impurities on the occurrence of filamentary superconductivity in La2CuO4 have been investigated by magnetic-susceptibility and electrical-resistivity measurements. Reducing the purity of the starting material degrades the superconductivity. La deficiency causes a fully reentrant superconducting-to-normal-state transition with decreasing temperature at temperatures below Tc. This behavior clarifies the incipient reentrance which is observed in nominally stoichiometric La2CuO4. We associate the reentrant transition with the recently observed structural transformation from the orthorhombic to a semiconducting monoclinic phase.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 45 | Pressure not reported | onset |
| La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | onset |
| La1.95CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | onset |
| La1.90CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | onset |
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