Preparation of Superconducting (Bi, Pb)-Sr-Ca-Cu Oxide Tapes with a Highly Oriented Structure by the Solidification Method

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Abstract
Composite tapes consisting of Au and superconducting Bi-Sr-Ca-Cu or Bi-Pb-Sr-Ca-Cu oxide with a pseudotetragonal structure were prepared by annealing the oxide phase which was slowly solidified on the Au tape. The oxide phase has a highly oriented structure, and the c plane lies parallel to the surface of the tape. The tapes were found to exhibit zero resistance at temperatures above 100 K as well as good bending flexibility. The critical current density (J c) at 77 K in the absence of applied field is 96 A/cm2 for the BiSrCaCu2O y -Au tape and 108 A/cm2 for the Pb0.2BiSrCaCu1.5O y -Au tape.