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.

• Received 11 June 1999

DOI:https://doi.org/10.1103/PhysRevLett.83.3061