Abstract

In this work we have studied the effect of applied electrical current on the resistive behavior of single phase Y 1−XPr XBa 2Cu 3O 7−Y [Y(Pr)123] polycrystalline samples with x close to the critical Pr concentration x c ≈ 0.57 above which the superconductivity vanishes. The obtained results suggest the occurrence of a superconducting-insulator transition (SIT) driven by the electrical current. In particular, a crossing of current-voltage (I–V) isotherms at magnetic-field-dependent current I C(H) is found, and the scaling behavior of nonlinear resistance R(I,T) = V(T)/I similar to that predicted in the scaling theory of SIT is obtained. We speculate that this possible current-induced SIT can be considered as the dynamical counterpart of the magnetic-field-tuned SIT.

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