NUMERICAL-SIMULATION OF THERMAL DEPINNING FOR A 2-DIMENSIONAL VORTEX SYSTEM

The dynamic behavior of the vortex system interacting with a large number of short-scaled pinning centers is simulated. At zero temperature, plastic and elastic regimes are observed depending on the relation between the vortex-vortex and the vortex-pin interaction potentials. As the temperature increases the influence of disorder decreases. This leads to a decrease of the critical pinning force and the restoration of the linear velocity-force dependences at small forces. Crossover to the flux flow regime takes place near the melting temperature of the vortex lattice.