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

TL;DR

This study investigates how vortex depinning affects the nonlinear current-voltage behavior in polycrystalline YPrBaCuO superconductors, revealing a power-law relation and dissipation processes linked to vortex dynamics below the critical temperature.

Contribution

It provides experimental evidence and theoretical interpretation of vortex depinning transition manifesting in nonlinear I-V characteristics of YPrBaCuO superconductors.

Findings

Nonlinear I-V curves fit a power law.

Depinning causes dissipation below Tc.

Vortex dynamics influence electrical behavior.

Abstract

We present our recent results on the temperature dependence of current-voltage characteristics for polycrystalline Y_{1-x}Pr_{x}Ba_2Cu_3O_7 superconductors with x = 0.0, 0.1 and 0.3. The experimental results are found to be reasonably well fitted for all samples by a power like law. According to the theoretical interpretation of the obtained results, nonlinear deviation of our current-voltage characteristics curves from Ohmic behavior below Tc is attributed to the manifestation of dissipation processes related to the current induced depinning of Abrikosov vortices.