Abstract
Strong excess flux-flow voltage noise commonly observed in thevicinity of the peak effect in superconductors has recently beenascribed to a novel unconventional noise mechanism. The mechanismconsists in random injection of the strongly pinned metastabledisordered vortex phase through the sample edges and itssubsequent random annealing into the weakly pinned ordered phasein the bulk. This results in large critical-current fluctuationscausing strong vortex velocity fluctuations. In this paper wepresent the evidence that flux-flow noise in the peak effectregime is dominated by vortex velocity fluctuations while densityfluctuations, considered in the conventional flux-flow noisemodels, are negligibly weak.
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