Monte Carlo Study of the Random-Field Ising Model

M.E.J. Newman, G.T. Barkema

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Using a cluster-flipping Monte Carlo algorithm combined with a generalization of the histogram reweighting scheme of Ferrenberg and Swendsen [Phys. Rev. Lett. 61, 2635 (1988); 63, 1195 (1989)], we have studied the equilibrium properties of the thermal random-field Ising model on a cubic lattice in three dimensions. We have equilibrated systems of L×L×L spins, with values of L up to 32, and for these systems the cluster-flipping method appears to a large extent to overcome the slow equilibration seen in single-spin-flip methods. From the results of our simulations we have extracted values for the critical exponents and the critical temperature and randomness of the model by finite size scaling. For the exponents we find ν=1.02±0.06, β=0.06±0.07, γ=1.9±0.2, and γ¯=2.9±0.2, where ν, β, γ, and γ¯ govern the critical singularities in the correlation length, magnetization, and connected and disconnected susceptibilities, respectively.
Original languageEnglish
Pages (from-to)393-404
JournalPhysical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
Volume53
Issue number1
DOIs
Publication statusPublished - Jan 1996

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