Abstract
The dynamics of the flux flow in the mixed state of high-Tc superconductor interacting with an artificial pinning array is considered. We calculate analytically the current density for the case of when the number of vortices outnumbers that of the pinning centers using the time-dependent Ginzburg-Landau equations in a magnetic field in the presence of strong thermal fluctuations. Our results show that the current density increases considerably with increasing pinning strength. It means that an original property of superconductor is recovered even in strong thermal fluctuations under a magnetic field by adding a pinning array to the mixed state of superconductor.
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