Effect of electron irradiation on vortex dynamics in YBa2Cu3O7-delta single crystals - art. no. 092513

We report on the drastic change of vortex dynamics with the increase of que nched disorder: for rather weak disorder we found a single-vortex creep reg ime, which we attribute to a Bragg-glass phase, while for enhanced disorder we found an increase of both the depinning current and activation energy w ith magnetic field, which we attribute to the entangled vortex phase. We al so found that the introduction of additional defects always increases the d epinning current, but it increases activation energy only for elastic vorte x creep, while it decreases activation energy for plastic vortex creep.