Lara, D. Peña; Plascak, J.A. - In: Physica A: Statistical Mechanics and its Applications 260 (1998) 3, pp. 443-454
The spin-σ Ising model with diluted and symmetric random crystal field is studied for σ⩾1 in the pair approximation based on Bogoliubov inequality for the free energy. Global phase diagrams are obtained in the temperature versus crystal field plane for the whole range of concentration in the...