Abstract
The effect of the current sweep rate (CSR) on the vortex dynamics in superconducting bulk sample of YBa 2Cu 3O 7− δ has been investigated at the temperatures near the critical temperature. It has been found that the CSR has several effects on the vortex motion by giving rise enhancement in dissipation as decreasing the CSR, significant time effects and instabilities in current–voltage ( I– V) curves. Those anomalies have been discussed in terms of the depinning/pinning together with the disorder in the coupling strength between the superconducting grains.
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