Oxide superconductor with high critical current density

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There is provided RE-Ba-Cu-O oxide bulk superconductors in which considerably high critical current density is obtained at relatively high temperature. In the present RE-Ba-Cu-O bulk superconductors, RE is a combination of two or more elements selected from La, Nd, Sm, Eu and Gd, at least one of them being La, Nd and Sm and the remainder being Eu or Gd, in which a parent phase thereof comprises a RE1+xBa2-xCu3Oy crystal wherein -0.1 or more under a condition where a magnetic field of 3T is impressed parallel to c axis of the crystal.