Superconducting copper-base alloy containing filaments of V3Ga

Superconducting copper-rich composites containing V3Ga filaments have been prepared by a process which consists of melting the constituent elements into ingots followed by subsequent cold working and heat treatment. The composites were fabricated into 1x1-mm rods, 0.25x3-mm ribbons, and 0.4-mm wires. The superconducting transition temperature is about 130K. The critical current density, J/subc/, at 4.20K and zero field is as high as 2.9x104 A/cm2 and decreases to 2x103 A/cm2 at 60 kG. J/subc/ was found to decrease only slightly with temperature up to 90K