Oxide superconductor with high critical current density and its manufacturing method.

摘要

An oxide superconductor capable of realizing a high critical current density and its manufacturing method requiring only a low temperature heat treatment. An oxide superconductor has a superconductive layer with a composition of RE1Ba2Cu3O7-x, where RE stands for any one of rare earth elements including Y, Er, Gd, Dy, Ho, Er, and Yb, which is formed on the substrate by RE1Ba2Cu3O7-x phase and CuO phase resulting from a decomposition of RE1Ba2Cu4O8 phase, in which the CuO phase and micro-defects caused by the decomposition function as pinning centers. This superconductive layer is formed by applying a solution containing organic compounds of a plurality of metallic elements for constituting the oxide superconductive layer; calcining the substrate applied with the solution to obtain a calcined body in which the organic compounds contained in the solution are thermally decomposed; heating the calcined body to produce RE1Ba2Cu4O8 phase; and decomposing the RE1Ba2Cu4O8 phase into RE1Ba2Cu3O7-x phase and CuO phase, to obtain the oxide superconductor.