Superconducting wire rod, superconducting coil, magnetic generator, and method for producing superconducting wire rod

A method for producing a superconducting wire rod, the method comprising:

• a filling step of filling a mixed powder of an Mg powder and a B powder into a first coating material formed of a metal that does not react with Mg to manufacture a monofilamentary wire;
• an arranging step of arranging a plurality of the monofilamentary wires around a center material of which at least an outer circumferential surface is formed of a metal that does not react with Mg;
• an inserting step of manufacturing a multifilamentary embedded material by inserting the center material and the plurality of the monofilamentary wires arranged around the center material into an outer shell material of which at least an inner circumferential surface is formed of a metal that does not react with Mg;
• a surface-reduction processing step of performing surface-reduction processing on the multifilamentary embedded material to thin the multifilamentary embedded material;
• and
• a heat treatment step of performing heat treatment on the thinned multifilamentary embedded material to allow the mixed powder to react to form an MgB2 superconductor core material.