If the interaction between vortices is stronger, the channels couple and the vortex lattice recrystallizes. At the crossover between these two phases, the lattice generates the greatest amount of voltage noise upon depinning, indicating that it may be possible to experimentally probe this transition. In the simulations described here, links have been made between experimentally accessible quantities such as vortex lattice structure factor measurements or vortex voltage noise, and microscopic phases of vortex motion. This offers valuable insights into the physics of the driven flux line lattice, and suggests lines of further research. Winding channels followed by the vortices inside a sample during a certain time interval under a low applied current.
Vortices enter on the left side of the figure and move towards the right.
White areas of the sample contain vortices that never moved. Pale blue areas of the sample indicate regions through which only a few vortices moved. Dark blue areas of the sample were heavily traveled by the vortices. All rights reserved.