التأثيرية المغناطيسية عند نقاط الانتقال بين الأطوار المغناطيسية المرتبة لشبيكة فيرّي مغناطيسية مختلطة من الرتبة 2 و 7/2

Fathi Omar Abubrig

doi:10.59743/jmset.v2i2.106

Authors

Fathi Omar Abubrig Physics Department, Faculty of Science, Alasmarya Islamic University, Zliten, Libya

DOI:

https://doi.org/10.59743/jmset.v2i2.106

Keywords:

Ising model, Ferrimagentic system, Critical temperatures, Magnetic susceptibility, Phase transition

Abstract

The mixed-spin-2 and spin-7/2 Ising ferrimagnetic system is studied by using the mean-field theory based on Bogoliubov inequality for free energy. In a previous paper, the ground state phase diagram of this system was constructed. In that phase diagram, eight ordered and four disordered phases were found. In this paper, at temperatures higher than zero, first-order critical lines which separate different-ordered phases are obtained in the temperature-mono-crystal field Plane at some selected points of mono-crystal field constants. New ordered phases which are separated by first ordered lines at low temperatures are found, the curves represent the thermal variation of the sublattice, and total susceptibilities are plotted in the regions of the new phases and some interesting results for the sublattice susceptibilities which change their behaviors by changing the phase are found.

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