Abstract
We have performed AC susceptibility measurement and shown the property of the vortex glass in the region near the pinned vortex liquid, where it is proposed that the velocity of flux diffusion, ν=ν0(j/jc)exp(-U/T), instead of ν=ν0exp(-U/T) in the region far away from the glass melting line for providing a gradual crossover to the viscous flux flow regime (ν ∝j, where j is current density). It is shown that the additional factor (j/j0) in the velocity is necessity to explain the experimental finding of the dependence of time scale t0 on the ac field amplitude.
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