High-field superconducting current-carrying capacities of composite-processed V3Ga tapes

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Abstract
Superconducting V3Ga tapes were produced by fabricating a composite of Cu–Ga alloy and a vanadium core and subsequent heat treatment at 625–‐800°C. The critical current of these composite‐processed (CP) V3Ga tapes was measured at 4.2 K in magnetic fields up to 210 kOe. In CP‐V3Ga tapes, the pronounced ``peak effect'' appears at fields near 170 kOe where a critical‐current density Jc of 1×105 A/cm2 is obtained. At the ``peak field'', Jc is nearly independent of the thickness d of the V3Ga layer. On the other hand, at low fields Jc decreases markedly with increasing thickness. When the Cu–Ga alloy matrix is supplemented by a small amount of manganese, the peak effect disappears consequently improving Jc at lower fields.