Effect of a random longitudinal field and crystal field on a decorated ferrimagnetic Ising model

Abstract The phase diagrams and magnetic properties of a decorated two-sublattices ferrimagnetic Ising models consisting of two magnetic atoms A and B with S A ( S A = 1 2 ) and S B ( S B > 1 2 ) are investigated by the use of an effective field theory based on a probability distribution method. The effects of the uniaxial crystal field D (on the B atoms) and the random longitudinal field, on the behavior of the system, are examined. We find a number of characteristic phenomena, such as the possibility of two compensation points, the re-entrant behavior and the existence of tricritical points.