Superconducting properties of V 2(Hf, Zr) laves phase multifilamentary wires

Abstract

Superconducting properties have been studied for newly developed V 2(Hf, Zr) multifilamentary wires. At 4.2 K. a μ 0H c2 of 22 T and an overall J c of 1 × 10 4 A/cm 2 at 17 T are obtained for these wires. At 1.8 K in a field of 15 T. the overall J c of these wires are twice as large as that of the bronze processed Nb 3Sn multifilamentary wire. The enhanced c at reduced temperature may be attributed to the rapid increase in μ 0H c2 by using the temperature scaling law of the pinning force density. μ 0H c2 measured in pulsed fields is about 28 T at 2.0 K. According to the temperature scaling law, the overall J c for 1.8 K. and at 20 T is estimated to be 2 × 10 4 A/cm 2 . Thus, the present V 2(Hf, Zr) multifilamentary wires are very promising for use in generating high magnetic fields in superfluid liquid helium.