Phase diagrams of the spin-5/2 Blume–Capel model

M. Karimou, A.S. de Arruda and M. Godoy

Physica A: Statistical Mechanics and its Applications, 2020, vol. 540, issue C

Abstract: We have used the Curie–Weiss mean-field approximation to study the effects of the random single-ion anisotropy and random magnetic field in the phase diagram and thermodynamic properties of the spin-5/2 Blume–Capel model. The phase diagrams have been presented in the temperature T∕J versus strength random single-ion anisotropy D∕J and strength random magnetic field h∕J planes. The magnetization dependence was plotted as a function of temperature and the strength single-ion anisotropy. These diagrams showed that the different phase transition types, first-or second-order between the ferromagnetic and paramagnetic phases, are dependent on the random parameters. Therefore, within these conditions, the model presents tricritical behavior.

Keywords: Blume–Capel model; Phase diagrams; Tricritical behavior (search for similar items in EconPapers)
Date: 2020
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:540:y:2020:i:c:s0378437119317467

DOI: 10.1016/j.physa.2019.123096

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