SUPERCONDUCTIVITY STABILIZING MATERIAL, SUPERCONDUCTING WIRE, AND SUPERCONDUCTING COIL

摘要

A superconductivity stabilizing material used for a superconducting wire and which is formed of a copper material containing at least one of additive elements selected from Ca, Sr, Ba, and rare earth elements in a range of 3 ppm by mass or more and 100 ppm by mass or less in total, with a remainder being Cu and unavoidable impurities, in which the total concentration of the unavoidable impurities, excluding O, H, C, N, and S which are gas components, is 5 ppm by mass or more and 100 ppm by mass or less, the half-softening temperature thereof is 200°C or lower, the Vickers hardness thereof is 55 Hv or more, and the residual resistance ratio (RRR) thereof is 50 or more and 500 or less.