Abstract
We have made a numerical study of the effect of thermal fluctuations on Josephson vortexdynamics in a stack of intrinsic Josephson junctions. Our simulations successfullyreproduced the experimental results such as the field dependence of the critical current, thenoise-rounded current–voltage characteristics and a periodic oscillation of the Josephsonvortex flow resistance. It was confirmed that the oscillation period of the Josephson vortexflow resistance is related to the modulation of the critical current rather than the vortexlattice structure. We found that in the dynamic state the triangular vortex lattice becomesstable independent of the field even at zero temperature. Furthermore, at finitetemperature, a thermally activated disordered vortex flow is observed in a low-bias regionwhere the Lorentz force is not large enough to induce the collective flow of vortices.
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