Meissner effect in Y-Ba-Cu-O and La-Sr-Cu-O high-temperature superconductors

C. Allgeier; J. S. Schilling; E. Amberger

doi:10.1103/PhysRevB.35.8791

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Meissner effect in Y-Ba-Cu-O and La-Sr-Cu-O high-temperature superconductors

C. Allgeier, J. S. Schilling, E. Amberger

DOI 10.1103/PhysRevB.35.8791 · Physical Review B

T1

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Abstract

Measurements of the static magnetic susceptibility confirm the existence of significant Meissner flux expulsion in the high-temperature superconductors Y1.2Ba0.8CuO4 and La1.85Sr0.15CuO4 below the onset temperatures of 85 and 39 K, respectively. The Y-Ba-Cu-O sample contains both superconducting and nonsuperconducting phases. The observed Meissner effect corresponds at 20 G to at least 20% of perfect diamagnetism in the black superconducting phase. For the single-phase La-Sr-Cu-O compound the Meissner signal at 10 G reaches a value corresponding to at least 24% of perfect diamagnetism.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Y1.2Ba0.8CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	85	Pressure unresolved	onset
La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	39	Pressure unresolved	onset
YBa2Cu3O7-d Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90	Pressure not reported	unknown