Short-time scaling in the critical dynamics of an antiferromagnetic Ising system with conserved magnetisation

Details Short-time scaling in the critical dynamics of an antiferromagnetic Ising system with conserved magnetisation Short-time scaling in the critical dynamics of an antiferromagnetic Ising system with conserved magnetisation

2002-02-14

arxiv.org/abs/cond-mat/0202235v1

Physics

Condensed Matter

Statistical Mechanics

To appear in Journal of Physics A

Scientific paper

We study by Monte Carlo simulations the short-time exponent $\theta$ in an antiferromagnetic Ising system for which the magnetisation is conserved but the sublattice magnetisation (which is the order parameter in this case) is not. This system belongs to the dynamic class of model C. We use nearest neighbour Kawasaki dynamics so that the magnetisation is conserved {\em locally}. We find that in three dimensions $\theta$ is independent of the conserved magnetisation. This is in agreement with the available theoretical studies, but in disagreement with previous simulation studies with global conservation algorithm. However, we agree with both these studies regarding the result $\theta_C \ne \theta_A$. We also find that in two dimensions, $\theta_C = \theta_A$.

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