Hall noise and transverse freezing in driven vortex lattices
Abstract
We study driven vortices lattices in superconducting thin films. Above the critical force Fc we find two dynamical phase transitions at Fp and Ft, which could be observed in simultaneous noise measurements of the longitudinal and the Hall voltage. At Fp 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 Ft there is a sharp transition to a frozen transverse solid where the Hall noise falls down abruptly and vortex motion is localized in the transverse direction.
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