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Critical current density of Y-Ba-Cu oxide superconductor prepared by a diffusion process

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4 Author(s)
Sadakata, N. ; Fujikura Ltd., Tokyo, Japan ; Sugimoto, M. ; Kohno, O. ; Tachikawa, K.

The formation of the YBa2Cu3O7-y layer has been investigated by a diffusion process as basic research for high-Tc superconductor fabrication. The starting materials were Y2BaCuO5 and barium cuprate. A dense layer of YBa2Cu3O7-y was formed on a Y2BaCuO5 substrate, and the starting barium cuprate layer was fully converted to the superconducting oxide. X-ray diffractometry revealed that the layer consisted of an orthorhombic crystal structure. The reacted specimens showed good superconductivity. A zero-resistance temperature of 91.5 K and a critical-current density of 1900 A/cm2 (77 K, 0 T) were achieved in the layer. Preparation conditions and superconducting properties, particularly Jc characteristics, are investigated. The diffusion phenomena that result in the formation of the YBa2Cu3 O7-y phase by this process are also discussed

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Magnetics, IEEE Transactions on  (Volume:25 ,  Issue: 2 )