Effect of oxygen on the filamentary superconductivity of the La2−xCuO4−δ system

S. W. Hsu; S. Y. Tsaur; H. C. Ku

doi:10.1103/PhysRevB.38.856

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Effect of oxygen on the filamentary superconductivity of the La2−xCuO4−δ system

S. W. Hsu, S. Y. Tsaur, H. C. Ku

DOI 10.1103/PhysRevB.38.856 · Physical Review B

T1

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Abstract

Electrical, magnetic, and crystallographic measurements have been carried out for lanthanum-and oxygen-deficient La2−xCuO4−δ samples prepared at various sintering temperatures and cooling rates in air, oxygen, or argon, in order to check the systematic variation of filamentary superconductivity and normal-state electrical resistivity with lanthanum and oxygen content. Correlation between physical properties and the oxygen stoichiometric parameter δ clearly indicates the crucial role of oxygen in the superconducting properties of this system. On the other hand, lanthanum deficiency has little effect on superconductivity.

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.	37	Pressure not reported	onset
La2-xCuO4-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	37	Pressure not reported	onset
La1.8CuO4-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	35	Pressure not reported	onset
(La1.85A0.15)CuO4-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	37	Pressure not reported	onset