Infinite disorder and correlation fixed point in the Ising model with correlated disorder
Groupe de Physique Statistique, Département P2M, Institut Jean Lamour (CNRS UMR 7198), Université de Lorraine, France
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Received: 16 October 2016
Revised: 2 November 2016
Published online: 5 April 2017
Recent Monte Carlo simulations of the q-state Potts model with a disorder displaying slowly-decaying correlations reported a violation of hyperscaling relation caused by large disorder fluctuations and the existence of a Griffiths phase, as in random systems governed by an infinite-disorder fixed point. New simulations of the Ising model (q = 2), directly made in the limit of an infinite disorder strength, are presented. The magnetic scaling dimension is shown to correspond to the correlated percolation fixed point. The latter is shown to be unstable at finite disorder strength but with a large cross-over length which is not accessible to Monte Carlo simulations.
© EDP Sciences, Springer-Verlag, 2017