Mean-Field Solution of the Mixed Spin-2 and Spin-5/2 Ising Ferrimagnetic System with Different Single-Ion Anisotropies

Fathi Abubrig

Department of Physics, Faculty of Science, Elmergeb University, Zliten, Libya.

DOI: 10.4236/ojapps.2013.33034                

Abstract

The mixed spin-2 and spin-5/2 Ising ferrimagnetic system with different anisotropies (D_A/z｜J｜) for the spin-2 and (D_B/z｜J｜) for the spin-5/2 is studied by the use of the mean-field theory based on the Bogoliubov inequality for the free energy. First, the ground state phase diagram of the system at zero temperature is obtained on the (D_A/z｜J｜,D_B/z｜J｜) plane. Topologically, different kinds of phase diagrams are achieved by changing the temperature and the values of the single ion anisotropies D_A/z｜J｜ and D_B/z｜J｜. Besides second-order transition lines, first order phase transition lines terminating at tricritical points, are found. The existence and dependence of a compensation temperature on single-ion anisotropies is also investigated.

Keywords

Mixed Spin; Ising Model; Ferrimagnetic; Sublattice Magnetization; Tricritical Points

Conflicts of Interest

The authors declare no conflicts of interest.

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