Oxide superconductor with outstanding tear stability and manufacturing process for the same

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The invention provides an oxide superconductor capable of sufficiently withstanding external force such as a large electromagnetic force and thermal stress accompanying rapid heating and cooling while in service, and internal stress so as to be able to exhibit a high trapped magnetic field stably over a long period of time. The oxide superconductor bulk body such as, for example, a copper oxide superconductor containing rare earth elements is impregnated with a low melting metal, and optionally has a thin film of the low melting metal formed on the external surface thereof. Such oxide superconductors can be produced by a process whereby the oxide superconductive bulk body kept in an atmosphere of reduced pressure is brought into contact with the low melting metal. Further, if the oxide superconductive bulk body is provided with pores beforehand, further improvement in production efficiency and product performance can be expected.