Depinning of a metastable disordered vortex lattice

We report on experiments investigating the depinning dynamics of a strongly pinned vortex lattice in 2H-NbSe2. We find that the depinning process star ts at currents that are well below the critical current of the entire latti ce and that it is governed by the formation of contiguous channels of mobil e vortices connecting the sample edges. We obtain the formation time of the first channel by monitoring the delayed voltage response to a driving curr ent step and by measuring the ramping rate dependence of the critical curre nt. The subsequent increase in the number of moving vortices is determined from the temporal evolution of the voltage response and the critical curren t.