High-Tc superconductivity in regions of possible compound formation: Y2−xBaxCuO4−x/2+δ and Y2−xBa1+xCu2O6−x/2+δ

Shiou-Jyh Hwu; S. N. Song; J. Thiel; K. R. Poeppelmeier; J. B. Ketterson; and A. J. Freeman

doi:10.1103/PhysRevB.35.7119

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High-Tc superconductivity in regions of possible compound formation: Y2−xBaxCuO4−x/2+δ and Y2−xBa1+xCu2O6−x/2+δ

Shiou-Jyh Hwu, S. N. Song, J. Thiel, K. R. Poeppelmeier, J. B. Ketterson, and A. J. Freeman

DOI 10.1103/PhysRevB.35.7119 · Physical Review B

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Abstract

High-Tc superconductivity is investigated in the Y-Ba-Cu-O system. Regions of possible compound formation are Y2−xBaxCuO4−x/2+δ and Y2−xBa1+xCu2O6−x/2+δ. Tc values >90 K are found for the former with x=0.8 (the Chu material) and for the latter with x=0.2 and may imply a common superconductivity phase in both samples. Critical fields determined by resistance and low-field dc susceptibility measurements are reported.

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.	94.5	Pressure unresolved	onset
Y1.2Ba0.8CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	91.2	Pressure unresolved	midpoint
Y1.2Ba0.8CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	92	Pressure unresolved	onset
Y1.8Ba1.2Cu2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	94.2	Pressure unresolved	onset
Y1.8Ba1.2Cu2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	93.3	Pressure unresolved	midpoint