The property of the vortex glass in the vicinity of the pinned vortex liquid for textured bulk YBa2Cu3O7

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, nu=nu(0)(j/j(c))exp(-U/T), instead of nu=nu(0)exp(-U/T) in the region far away from the glass melting line for providing a gradual crossover to the viscous flux flow regime (nu proportional to j, where j is current density). It is shown that the additional factor (j/j(0)) in the velocity is necessity to explain the experimental finding of the dependence of time scale t(0) on the ac field amplitude.