Nb3Sn superconducting wire and precursor therefor

摘要

A precursor for fabricating a Nb 3 Sn superconducting wire by an internal Sn process includes one or a plurality of stabilizing copper portions (4b) collectively disposed in the center, each stabilizing copper portion being provided with a diffusion barrier layer (6b) in the periphery thereof, and a superconducting matrix portion disposed so as to surround the one or the plurality of stabilizing copper portions, the superconducting matrix portion including a Nb or Nb-based alloy core (2) and a Sn or Sn-based alloy core (3) embedded in a Cu or Cu-based alloy matrix (4).