OXIDE SUPERCONDUCTOR, SUPERCONDUCTING WIRE, AND MANUFACTURING METHOD THEREFOR

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Provided is an oxide superconductor having a composition represented by REaBabCu3O7-x, where RE represents one rare earth element or a combination of at least two rare earth elements, 1.05≤a≤1.35, 1.80≤b≤2.05, and x represents the oxygen deficiency amount. In the oxide superconductor, a superconducting phase contains a non-superconducting phase having an outer diameter of 30 nm or less.