Influence of temperature on the depinning transition of driven interfaces

E-ISSN： 1286-4854|44|5|634-640

ISSN： 0295-5075

Source： EPL (EUROPHYSICS LETTERS), Vol.44, Iss.5, 2010-03, pp. : 634-640

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Abstract

We study the dynamics of a driven interface in a two-dimensional random-field Ising model close to the depinning transition at small but finite temperatures T using Glauber dynamics. A square lattice is considered with an interface initially in the (11)-direction. The drift velocity v is analyzed using finite-size scaling at T=0 and additionally finite-temperature scaling close to the depinning transition. In both cases a perfect data collapse is obtained from which we deduce $\beta \approx 1/3$ for the exponent which determines the dependence of v on the driving field, $\nu \approx 1$ for the exponent of the correlation length and $\delta \approx 5$ for the exponent which determines the dependence of v on T.