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Depinning of vortices in percolative superconductor containing fractalclusters of a normal phase is considered. Transition of the superconductor intoa resistive state corresponds to the percolation transition from a pinnedvortex state to a resistive state when the vortices are free to move. Themotion of the magnetic flux transferred by these vortices gives rise to theregion of initial dissipation on current-voltage characteristic. The influenceof normal phase clusters on distinctive features of current-voltagecharacteristics of percolative type-II superconductors is considered. It isfound that an increase in the fractal dimension of the normal phase clusterscauses the initial dissipation region to broaden out. The reason of this effectis an increase in the density of free vortices broken away from the pinningcenters by the Lorentz force. Dependencies of the free vortex density on thefractal dimension of the normal phase cluster boundaries are obtained.Comment: 7 pages with 2 figure

Depinning at the initial stage of the resistive transition in superconductors with a fractal cluster structure