Anisotropy of superconducting Pb2Sr2(Y0.7Ca0.3)Cu3O8+δ and Pb2Sr2Y1−yCu3O8+δ

T. R. Chien; W. R. Datars; J. S. Xue; M. W. Fok; J. E. Greedan

doi:10.1103/PhysRevB.50.9627

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Anisotropy of superconducting Pb2Sr2(Y0.7Ca0.3)Cu3O8+δ and Pb2Sr2Y1−yCu3O8+δ

T. R. Chien, W. R. Datars, J. S. Xue, M. W. Fok, J. E. Greedan

DOI 10.1103/PhysRevB.50.9627 · Physical Review B

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Abstract

The London-penetration-depth anisotropy ratio γ of Pb2Sr2(Y0.7Ca0.3)Cu3O8+δ and Ca-free Pb2Sr2Y1−yCu3O8+δ (y≊0.1) single crystals has been measured by the equilibrium torque magnetometry method. γ values are found to be in the range of 10 to 11 and are comparable to that of YBa2Cu3O7−δ rather than Bi2+xSr2Ca1−xCu2O8+δ although Pb2Sr2(Y0.7Ca0.3)Cu3O8+δ is structurally similar to both, with its c-axis lattice constant 30% larger than that of YBa2Cu3O7−δ. The γ of a Pb2Sr2(Sm0.5Eu0.5)Cu3O8+δ crystal was measured to be 13±3.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Pb2Sr2(Y0.7Ca0.3)Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	79	Pressure not reported	onset
Pb2Sr2Y1-yCu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	70	Pressure not reported	onset
Pb2Sr2(Sm0.5Eu0.5)Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	45	Pressure not reported	onset
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2+xSr2Ca1-xCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Pb2Sr2(Er0.5Ca0.5)Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	55	Pressure not reported	onset
Pb2Sr2Eu1-yCu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	55	Pressure not reported	onset