Interface Motion in Random Media at Finite Temperature

Details Interface Motion in Random Media at Finite Temperature Interface Motion in Random Media at Finite Temperature

1994-08-10

arxiv.org/abs/cond-mat/9408032v1

Physics

Condensed Matter

harvmac.tex, 30 pages, including 9 figures, available upon request. SU-rm-940731

Scientific paper

10.1103/PhysRevB.51.6296

We have studied numerically the dynamics of a driven elastic interface in a random medium, focusing on the thermal rounding of the depinning transition and on the behavior in the $T=0$ pinned phase. Thermal effects are quantitatively more important than expected from simple dimensional estimates. For sufficient low temperature the creep velocity at a driving force equal to the $T=0$ depinning force exhibits a power-law dependence on $T$, in agreement with earlier theoretical and numerical predictions for CDW's. We have also examined the dynamics in the $T=0$ pinned phase resulting from slowly increasing the driving force towards threshold. The distribution of avalanche sizes $S_\|$ decays as $S_\|^{-1-\kappa}$, with $\kappa = 0.05\pm 0.05$, in agreement with recent theoretical predictions.

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