Effect of electron irradiation on vortex dynamics inYBa2Cu3O7−δsingle crystals

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Abstract
We report on the drastic change of vortex dynamics with the increase of quenched disorder: for rather weak disorder we found a single-vortex creep regime, which we attribute to a Bragg-glass phase, while for enhanced disorder we found an increase of both the depinning current and activation energy with magnetic field, which we attribute to the entangled vortex phase. We also found that the introduction of additional defects always increases the depinning current, but it increases activation energy only for elastic vortex creep, while it decreases activation energy for plastic vortex creep.
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