Influence of Tensile Stresses on the Superconducting Temperature of Multifilamentary Nb3Sn Composite Conductors
The need for Nb3Sn multifilament conductors in large magnet systems has generated interest in the mechanical and associated electrical properties of these composites. The superconducting compound Nb3Sn in bronze-processed conductors is subjected to a compressive strain originating from the thermal contraction of the outer bronze matrix. Such compressive strains lower the compound’s superconducting temperature, T c , and removal of the compressive strains by etching off the bronze matrix restores the original T c Recent investigations have suggested that tensile loading of these composite superconductors can increase T c  This report presents a study of T c and its relationship to both internal prestrains and applied tensile loads at 4.2 K in Nb3Sn composite superconductors.
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