Abstract
We report on the influence of the microstructure on the AC and DC magnetic properties ofCu–3.5% Nb nanofilamentary wires. Samples obtained from a single Cu–3.5% Nb wire weresubsequently submitted to different plastic strain levels via drawing so that theirmicrostructure was altered. Noticeable differences are observed in their isothermal DCmagnetization curves that present a double-peak structure. The first peak, which occurs atlow magnetic fields, is attributed to superconductivity induced in the Cu matrix due to theproximity effect. It is argued that the second peak is related exclusively to niobium. Thedependence of these two distinct peaks on the characteristic nanometre length scales ofthe samples, i.e. dimension of the Nb filaments and interfilamentary spacing, arediscussed.
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