Gliding dislocations in a driven vortex lattice

The dynamics of dislocations in a two-dimensional vortex lattice is studied in the presence of a pinning potential and a transport current. We present a nonequilibrium mechanism that generates an average glide velocity V{sub d} of the dislocation with respect to the moving vortex lattice. It is found to decay like V{sub d}{approximately}v{sup {minus}4} for large lattice velocity v. From this result a crossover between a regime where the dislocations are pinned by the impurities and a regime where dislocations move coherently with the vortex lattice is established. {copyright} {ital 1997} {ital The American Physical Society}