Abstract
The influence of impurities on the normal and superconducting state properties of CuNb composite wires prepared by in situ technique have been studied. The results show an increase in the normal state resistivity, resistivity ratio, critical current density and upper critical field — important parameters for device application of superconducting composite wires with the addition of indium and tantalum impurities. There is, however, a decrease in the transition temperature and the transition width of the wires.
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