Hall noise and transverse freezing in driven vortex lattices

We study driven vortex lattices in superconducting thin films. Above the critical force F-c we find two dynamical phase transitions at F-p and F-t, which could be observed in simultaneous noise measurements of the longitudinal and Hall voltage. At F-p there is a transition from plastic flow to smectic flow, where the voltage noise is isotropic (Hall noise = longitudinal noise) and there is a peak in the differential resistance. At F-t there is a sharp transition to a frozen transverse solid, where the Hall noise falls abruptly and vortex motion is localized in the transverse direction.