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We present our recent results on the temperature dependence ofcurrent-voltage characteristics for polycrystalline Y_{1-x}Pr_{x}Ba_2Cu_3O_7superconductors with x = 0.0, 0.1 and 0.3. The experimental results are foundto be reasonably well fitted for all samples by a power like law. According tothe theoretical interpretation of the obtained results, nonlinear deviation ofour current-voltage characteristics curves from Ohmic behavior below Tc isattributed to the manifestation of dissipation processes related to the currentinduced depinning of Abrikosov vortices.

Manifestation of vortex depinning transition in nonlinear current-voltage characteristics of polycrystalline superconductor Y_{1-x}Pr_{x}Ba_2Cu_3O_7