Depinning of a driven vortex lattice in high-T-c films

We have investigated the influence of the driving force and motion of the v ortex lattice on the vortex depinning and dissipation in vibrating YBa2Cu3O 7 superconducting films. At high enough driving force our results show a mo tional narrowing of the depinning transition. In this regime the temperatur e dependence of the energy dissipation can he quantitatively understood wit h the diffusion model without free parameters. Additionally, the simultaneo us measurement of the vibrating superconductor with its I-V characteristics shows that the depinning temperature coincides with the so-called "glass" transition temperature. [S0163-1829(99)09729-5].