Hadjiagapiou, Ioannis A. - In: Physica A: Statistical Mechanics and its Applications 390 (2011) 20, pp. 3204-3215
The Ising model in the presence of a random field is investigated within the mean field approximation based on Landau expansion. The random field is drawn from the asymmetric and anisotropic bimodal probability distribution P(hi)=pδ(hi−h0)+qδ(hi+λ∗h0), where the site probabilities p,q...