Improvements in High Field Properties of Continuous Ultrafine Nb3Al MF Superconductor
Attempts have been made to improve high field properties of continuous ultrafine Nb3Al multifilamentary superconductors. The Al core, of which the hardness is a key to the excellent cold-workability of the Nb/Al composite, was hardened by being alloyed with Ge by the combination with Cu and Ag, resulting into an increase in TC, HC2 and JC of the Nb/Al composite at high fields. Very short heat treatments at temperatures above 1200°C were carried out by applying a large current pulse directly to the sample so that remarkable improvements in high field properties are attained.
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