Influence of Mechanical Constraints on Critical Currents of Superconducting Surface Layers of Nb3Sn on Niobium and V3Ga on Vanadium in Transverse Magnetic Fields
Soft superconductors in general show an increase In critical temperature  when strained In one direction. However, elastic torsion seems to have no Influence on the critical field . Past work  has shown that superconducting surface layers of Nb3Sn on niobium and core wires  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 , a ductile material, which shows an increase in critical current after suitable deformation.
KeywordsCritical Current Transverse Magnetic Field Mechanical Constraint Cylindrical Layer Nb3Sn Layer
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