Resonances, instabilities, and structure selection of driven Josephson lattice in layered superconductors

We investigate the dynamics of the Josephson vortex lattice in layered high -T-c superconductors at high magnetic fields. It is shown that the average electric current depends on the lattice structure and is resonantly enhance d when the Josephson frequency matches the frequency of the plasma mode. We find the stability regions of a moving lattice. It is shown that a specifi c lattice structure at a given velocity is uniquely selected by the boundar y conditions; at small velocities a periodic triangular lattice is stable a nd looses its stability at some critical velocity. At even higher velocitie s, a structure close to a rectangular lattice is restored.