METHOD FOR MANUFACTURING MAGNESIUM DIBORIDE SUPERCONDUCTING THIN-FILM WIRE MATERIAL, AND MAGNESIUM DIBORIDE SUPERCONDUCTING THIN-FILM WIRE MATERIAL

摘要

The purpose of the present invention is to provide an optimum average particle size range for the purpose of increasing the pinning force and improving the Jc in an MgB₂ thin-film wire material, and to provide a method for producing an MgB₂ thin-film wire material having an optimum average particle size. Disclosed is a method for producing an MgB₂ thin-film superconducting wire material, wherein the MgB₂ thin-film superconducting wire material is characterized by being formed from aggregates of MgB₂ particles characterized by each having a columnar structure of which the orientation is regulated in the direction perpendicular to the surface, wherein the volume fraction of MgB₂ is 90% or more relative to the whole volume of the thin-film wire material, an MgB₂ thin film having a film thickness of 1000 to 10000 nm inclusive is formed in the lateral direction, and the particles have an average particle size of 30 to 200 nm inclusive, preferably 40 to 100 nm inclusive.