Wang-Landau study of the critical behavior of the bimodal 3D-Random Field Ising Model

Laura Hernandez (1) , Horacio Ceva (2)

1 LPTM - UMR 8089 - Laboratoire de Physique Théorique et Modélisation
2 Departamento de Fisica, CNEA

We apply the Wang-Landau method to the study of the critical behavior of the three dimensional Random Field Ising Model with a bimodal probability distribution. For high values of the random field intensity we find that the energy probability distribution at the transition temperature is double peaked, suggesting that the phase transition is first order. On the other hand, the transition looks continuous for low values of the field intensity. In spite of the large sample to sample fluctuations observed, the double peak in the probability distribution is always present for high fields.

Mots clés: Phase transitions; Disordered Magnetic Systems; Wang-Landau simulations.; Wang-Landau simulations

Domaines: Mécanique statistique [cond-mat.stat-mech]; Systèmes désordonnés et réseaux de neurones [cond-mat.dis-nn]

Laura Hernandez, Horacio Ceva. Wang-Landau study of the critical behavior of the bimodal 3D-Random Field Ising Model. 2007. ⟨hal-00172024⟩