Electrical resistivities of normal-superconducting two-phase mixtures

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Abstract
Electrical resistivities of multiphased wires in which one phase is a continuous normal conductor and the other is a discontinuous superconducting phase have been studied as a function of mechanical reduction (Re) and current density J. Even for J values of 103 A/cm2 the electrical resistivity decreases somewhat faster than 1/Re3, a dependence that can be predicted from a number of metallurgical microstructure models. For J values of 10 A/cm2 or less, most of the current is carried by superconducting or superconductinglike paths. Metallurgical studies rule out the possibility of continuous Nb paths and, therefore, the proximity effect is the most likely cause for the reduced resistivity even though the average interparticle spacing is large.