Patent ID: 7662749

Claim:
A rare earth-containing tape-shaped oxide superconductor, comprising in sequence: a biaxially-oriented substrate, which is formed by a heat treatment after cold working, of Ni, Ni based alloy, Cu or Cu based alloy; a first intermediate layer, formed on the substrate, comprising a A 2 Zr 2 O 7 (wherein A is an element selected from the group consisting of Ce, Gd and Sm), the intermediate layer having a surface smoothness of 5 nm or less and wherein the intermediate layer is formed by repeated calcination of a coating of a mixed organic solvent solution which contains, dissolved therein, metal organic acid salts or organic metallic compounds including Zr and at least one metallic element selected from Ce, Gd and Sm; a second intermediate layer formed on the first intermediate layer, comprising a CeO 2 film or Ce—Gd—O film; and an oxide superconducting layer, formed on the second intermediate layer.