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We present our recent results on the temperature dependence of current–voltage characteristics for polycrystalline Y 1−x Pr x Ba 2 Cu 3 O 7−δ superconductors with x=0.0, 0.1 and 0.3. The experimental results are found to be reasonably well fitted for all samples by a power like law of the form V=R(I−Ic)a(T). Here, we assume that a(T)=1+Φ0IC(T)/2πkBT and IC(T)=IC(0)(1−T/TC)3/2...
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