Properties of superconducting Nb3Ga materials.

The superconducting-to-normal phase boundary was studied experimentally in several Nb-Ga materials as a function of applied field and superconducting transition temperature. When properly fabricated, the stoichiometric material Nb3Ga yields a superconducting transition temperature of 20.3 K, the highest yet reported for a binary alloy. Preliminary work shows that Nb-Ga materials with a superconducting transition temperature of 19 K can be made by chemical vapor deposition, a process commonly used for producing commercial superconducting tape.