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

Fathi Abubrig
2013 Open Journal of Applied Sciences  
The mixed spin-2 and spin-5/2 Ising ferrimagnetic system with different anisotropies ( A D z J ) for the spin-2 and ( ) 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 B D z J ( ) , A B D z J D z J , different kinds of phase diagrams are achieved by changing the temperature and the values of the single ion anisotropies plane.
more » ... ally A D z J and B D z des sec r 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. J . Besi ond-orde
doi:10.4236/ojapps.2013.33034 fatcat:u6k72t3drvenbaqalghxeanpny