Thermodynamical properties of the random field mixed spin Ising model

A theoretical study of a mixed spin Ising system consisting of spin-1/2 and spin-1 with a random field is studied by the use of the finite cluster app roximation within the framework of a single-site cluster theory. In this ap proach, the phase diagrams and magnetizations are investigated for the simp le cubic lattice when the random field is bimodally and trimodally distribu ted. The internal energy, specific heat and susceptibility are also calcula ted for both kinds of the probability distributions. (C) 2001 Elsevier Scie nce B.V. All rights reserved.