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The mixed spin-2 and spin-5/2 Ising ferrimagnetic system with different anisotropies (DA/z｜J｜) for the spin-2 and (DB/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 (DA/z｜J｜,DB/z｜J｜) plane. Topologically, different kinds of phase diagrams are achieved by changing the temperature and the values of the single ion anisotropies DA/z｜J｜ and DB/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.
The mixed spin-3/2 and spin-2 Ising ferrimagnetic system with
different single-ion anisotropies in the absence of an external magnetic field
is studied within the mean-field theory based on Bogoliubov inequality for the
Gibbs free energy. Second-order critical lines are obtained in the
temperature-anisotropy plane. Tricritical line separating second-order
and first-order lines is found. Finally, the existence and dependence of a
compensation points on single-ion anisotropies is also investigated for the
system. As a result, this mixed-spin model exhibits one, two or three compensation
temperature depending on the values of the anisotropies.
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The magnetic properties of a mixed Ising ferrimagnetic system consisting of spin-3/2 and spin-2 with different single ion anisotropies and under the effect of an applied longitudinal magnetic field are investigated within the mean-field theory based on Bogoliubov inequality for the Gibbs free energy. The ground-state phase diagram is constructed. The thermal behaviours of magnetizations and magnetic susceptibilities are examined in detail. Finally, we find some interesting phenomena in these quantities, due to applied longitudinal magnetic field.