Magnetic and thermodynamic properties of a mixed spin-1and spin-7/2 Blume-Capel Ising ferrimagnetic system

The magnetic properties of a mixed-spin Blume-Capel Ising ferrimagnetic system are investigated. It has been studied the effect of the crystal field and longitudinal magnetic field on the magnetic properties and thermodynamic quantities of the system, respectively. So, it has been calculated Gibbs free energy of the mixed spin ferrimagnetic model such that the total magnetizations and compensation points have been examined by minimizing the free energy based on the Bogoliubov inequality. A mixed spin-1 and spin-7/2 ferrimagnet with different single-ion anisotropies, i.e., crystal fields on a square lattice, is investigated. It has been used a mean field method and found that the crystal-field interaction plays an important role in the existence and induction of compensation points. Some outstanding behaviors in the temperature dependences of total magnetizations in the presence of longitudinal fields have been shown as well.