Abstract
Soft superconductors in general show an increase In critical temperature [1] when strained In one direction. However, elastic torsion seems to have no Influence on the critical field [2]. Past work [3] has shown that superconducting surface layers of Nb3Sn on niobium and core wires [4] under pull, torsion, and uniaxial compression exhibit a decrease in critical temperature which Is governed by a parabolic relationship. This effect has now also been established for superconducting surface layers of V3Si and V3Ga on vanadium. These results have led us to the search for a similar empirical relationship- between the critical currents and constraints In transverse magnetic fields. Such a reproducible relationship could not be found since a well-defined equation for the quenching curve does not exist. However, a remarkable decrease in the critical currents was found at fixed magnetic field with Increase of the applied constraint. This is In contrast to results for Nb-Zr [5], a ductile material, which shows an increase in critical current after suitable deformation.
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