OXIDE SUPERCONDUCTOR AND ITS PREPARATION METHOD

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PROBLEM TO BE SOLVED : To provide an oxide bulk superconductor very high in critical current density and trapped magnetic field and its preparation method. SOLUTION : The superconductor is a (LRE, HRE)-Ba-Cu-O superconductor and has a structure comprising a superconductive phase and a particulate phase dispersed therein. The superconductive phase contains at least two rare earth elements represented by LRE and HRE and is represented by (LREa, HRE1-a)1+xBa2-xCu3Oy (wherein 0

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