Magnetic-flux creep at the initial stage of resistive transition in superconductors with fractal clusters of normal phase

The effect of magnetic-flux creep on an electric field induced in a percolating superconductor containing fractal clusters of normal phase is considered. Current voltage characteristics of these superconductors are obtained taking into account the effect of fractal dimensionality of cluster boundaries on nonlinearity of CVC at low transport currents. It has been found that fractality of clusters of the normal phase suppresses magnetic-flux creep at the initial stage of resistive transition, thus increasing the current-carrying ability of the superconductor.