Abstract
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.
Highlights
During the past several decades, both experimental and theoretical studies have accumulated in the area of molecular-based magnetic materials [1,2,3]
These materials include bimetallic molecular-based magnetic materials in which two kinds of magnetic atoms alternate regularly and exhibit ferrimagnetic properties and they are well interpreted by the use of mixed-spin Ising systems which have less translational symmetry than their single-spin counterparts since they consist of two interpenetrating unequivalent sublattices
Bobak and Dely investigated the effect of single-ion anisotropy on the phase diagram of the mixed spin-3/2 and spin-2 Ising system by the use of a mean-field theory based on the Bogoliubov inequality for the free energy [24]
Summary
During the past several decades, both experimental and theoretical studies have accumulated in the area of molecular-based magnetic materials [1,2,3] These materials include bimetallic molecular-based magnetic materials in which two kinds of magnetic atoms alternate regularly and exhibit ferrimagnetic properties and they are well interpreted by the use of mixed-spin Ising systems which have less translational symmetry than their single-spin counterparts since they consist of two interpenetrating unequivalent sublattices. Bobak and Dely investigated the effect of single-ion anisotropy on the phase diagram of the mixed spin-3/2 and spin-2 Ising system by the use of a mean-field theory based on the Bogoliubov inequality for the free energy [24]. We apply the mean-field theory based on Bogoliubov inequality for the Gibbs free energy to study the effects of two different single-ion anisotropies in the phase diagram and in the compensation.
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