Abstract
We have studied short range fluctuations around the infinite-range model of charge density wave (CDW) dynamics. We find that the inhomogeneity of the local field, which is neglected in the infinite-range approximation has a dramatic effect on the transition. In the Bethe approximation the critical behaviour is nonuniversal. In particular, the current exponent is ζ = 3/2 log (z - 1)/[log (z) + log (1 + f/J)], where z is the number of neighbors, f the pinning strength, and J the elastic coupling.
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