an improved method for producing a vanadium - gallium superconductor wire having aluminum as a component thereof is disclosed , said wire being encased in a gallium bearing copper sheath . the superconductors disclosed herein may be fabricated under normal atmospheres and room temperatures by forming a tubular shaped billet having a core composed of an alloy of vanadium and aluminum and an outer sheath composed of an alloy of copper , gallium and aluminum . thereafter the entire billet is swage reduced to form a wire therefrom and heat treated to form a layer of v 3 ga in the interior of the wire .