TITLE:
Mean-Field Solution of a Mixed Spin-3/2 and Spin-2 Ising Ferrimagnetic System with Different Single-Ion Anisotropies
AUTHORS:
Fathi Abubrig
KEYWORDS:
Ising Model; Magnetization; Compensation Point; Critical Lines; Tricritical Point; Anisotropy; Mixed-Spin
JOURNAL NAME:
Open Journal of Applied Sciences,
Vol.3 No.2,
June
20,
2013
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.