OXIDE SUPERCONDUCTOR, SUPERCONDUCTING WIRE, AND MANUFACTURING METHOD THEREFOR

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An oxide superconductor has a composition expressed by REaBabCu3O7-x, where RE represents one rare earth or a combination of two or more of a rare earth, a satisfies 1.05 ≤ a ≤ 1.35, b satisfies 1.80 ≤ b ≤ 2.05, and x represents an amount of oxygen deficiency, and a non-superconducting phase having an outer diameter of 30 nm or less is included in a superconducting phase.