First-order transition features of the 3D bimodal random-field Ising model

Nikolaos G. Fytas, A. Malakis, K. Eftaxias

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    49 Citations (Scopus)


    Two numerical strategies based on the Wang–Landau and Lee entropic sampling schemes are implemented to investigate the first-order transition features of the 3D bimodal (± h) random-field Ising model at the strong disorder regime. We consider simple cubic lattices with linear sizes in the range L = 4–32 and simulate the system for two values of the disorder strength: h = 2 and 2.25. The nature of the transition is elucidated by applying the Lee–Kosterlitz free-energy barrier method. Our results indicate that, despite the strong first-order-like characteristics, the transition remains continuous, in disagreement with the early mean-field theory prediction of a tricritical point at high values of the random field.
    Original languageEnglish
    Article numberP03015
    JournalJournal of Statistical Mechanics: Theory and Experiment
    Publication statusPublished - 28 Mar 2008

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