RE123-based oxide superconductor from a on and method of making the same

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A method of production of a RE123-based oxide superconductor, said method of production of a RE123-based oxide superconductor characterized by comprising (i) firing a pulse laser at an oxide-based target including RE, Ba, and Cu satisfying the following formulas (1) and (2) to form a plume and (ii) holding a substrate in that plume to form an RE123-based oxide superconducting film : 0.8≰2RE/Ba<1.0   (1) 0.8≰3Ba/2Cu<1.0   (2) where, RE is one or more of Y, La, Nd, Sm, Eu, Gd, Dy, Ho, and Er