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We report results of large Monte Carlo simulations of an experimentally realizable random-field system: the three-dimensional dilute Ising antiferromagnetic in a field. We find that the correlation time diverges dramatically as TT₂; the results are consistent with a proposed new type of activated dynamic scaling. The transition appears to be continuous, with effective critical exponents =0. 50. 1 and \~{}=-1. 00. 3 for strong fields, away from the weak-field regime where crossover effects distort exponent estimates. These strong-field exponents satisfy recently derived inequalities.
Ogielski et al. (Mon,) studied this question.
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