Superconducting properties of V2(Hf,Zr) laves phase multifilamentary wires

Fabrication method, superconducting properties and strain effects of V2(Hf,Zr) Laves phase multifilamentary wires have been investigated. Wires containing 1634 V2(Hf,Zr) filaments were fabricated by the composite process. The dependence of superconducting properties on compositions, heat treatment conditions and measuring temperatures was examined. Superconducting transition temperatures, Tc, of about 9.7K, upper critical fields, μ,Hc2, exceeding 21T and critical current densities, Jc, of about 1 × 10⁵A/cm²at 13T and 4.2K were obtained. Overall Jcof the 1634-filament wire was about 1 × 10⁴A/cm²at 14T and 4.2K. At 12.5T Jcwas increased by a factor of three when temperature was reduced from 4.2K to 1.8K. μ,Hc2estimated on the basis of Jcversus magnetic induction curves at different strain levels was found to be independent of intrinsic strains up to 0.9%.