Abstract
The effect of In addition on the superconducting properties of V 3Ga multifilamentary superconductors has been investigated. The critical temperature and the critical field H c2 are nearly independent of In content. The observed gain in critical current of up to 100% is due to a rise in both critical current density of the V 3Ga layer and the thickness of the V 3Ga layer itself. This is caused by grain refinement and significant enhancement of the layer growth rate. The In is added by deposition of an In layer onto the surface of a CuGa-V composite with subsequent annealing. For In layers in excess of 4 μm a second CuInGa phase is formed preventing a further rise in critical current and causing embrittlement of the wire. For the temperature dependence of the critical current density a modified scaling law is proposed.
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