Phase transitions of Ising mixed spin 1 and 3/2 with random crystal field distribution

• The Ising mixed spin-1 and spin-3/2, in the presence of the random crystal field, is studied.
• The mean field approach based on the Bogoliubov inequality for the Gibbs free energy is used.
• Five topologies of the phase diagrams have been presented and discussed.

The thermal and magnetic properties of the mixed spin-1 and spin-3/2 in the presence of the random crystal field are studied within the mean field approach based on the Bogoliubov inequality for the Gibbs free energy. The model exhibits first, second order transitions, a tricritical point, triple point and an isolated critical end point. It is found that the system displays simple and double compensation temperatures, five topologies of the phase diagrams. A re-entrant phenomenon is also discussed and the thermal dependences of total magnetization according to extended Neel classification have been also given.