Abstract
This work presents results about the influence of the applied magnetic field on the branching point of the resistive transition in granular samples of the Y 1− x Pr x Ba 2Cu 3O 7− δ (Y123 + Pr) system. Single phase samples of x=0.0 and 0.35 composition were prepared by solid state reaction method. Using several resistance curves as a function of the temperature measured at different applied currents we defined branching points at each magnetic field which was ranged from 0 up to 9 T. We have observed that a line in the H– T phase diagram separates the weak coupling state from decoupled regime of the superconducting clusters. Measurements of current–voltage curves and magneto-resistance hysteresis loops agree with such discussion.
Published Version
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