Not applicable. statement regarding federally sponsored under of a metallic wire superconductor phase nb - sn.

摘要

A metal wire, a precursor for the metal wire superconductor phase nb - sn comprises a structure having a plurality of modules which are each composed of a metal core to sn placed in a metal matrix based on cu and the metal filaments based on nb concentrically around the core are obtained by adjusting the amount of metallic cores to sn in each module, in order to form the limits of the layers of bronze in phase e that is to form by reacting, sn of the metallic cores to sn and the metallic matrix based on cu by heat treatment in the range comprising all or part which is not substantially less than 0,08 and not greater than 0,32 of the region of the existence of the metal filaments based on nb.