Phase Diagram of the mixed spin-2 and spin-5/2 Ising system with two different single-ion anisotropies

TL;DR

This study investigates how two distinct single-ion anisotropies influence the phase diagram and compensation temperature of a mixed spin-2 and spin-5/2 Ising ferrimagnetic system using mean-field theory.

Contribution

It introduces a detailed analysis of the effects of dual single-ion anisotropies on phase transitions and compensation points in a mixed-spin Ising model, employing Landau expansion and mean-field theory.

Findings

Phase diagrams exhibit tricritical points.

Critical and compensation temperatures increase with anisotropy.

Mean-field theory effectively describes phase behavior.

Abstract

In this paper we present a study of the effects of two different single-ion anisotropies in the phase diagram and in the compensation temperature of the mixed spin-2 and spin-5/2 Ising ferrimagnetic system. We employed the mean-field theory based on the Bogoliubov inequality for the Gibbs free energy. Also we found the Landau expansion of the free energy in the order parameter to describe the phase diagrams. In the plane critical temperature versus single-ion anisotropie the phase diagram displays tricritical behavior. The critical and compensation temperatures increase when the single-ion anisotropies increase.