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 approximation within the framework of a single-site cluster theory. In this approach, the phase diagrams and magnetizations are investigated for the simple cubic lattice when the random field is bimodally and trimodally distributed. The internal energy, specific heat and susceptibility are also calculated for both kinds of the probability distributions.