The Pair Approximation method for the ferromagnetic Heisenberg model with spin S=1 and arbitrary range of interactions. Application for the magnetic semiconductor CrIAs

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:513

Article

Balcerzak, T.¹  Szalowski, K.¹ 

[1] Univ Lodz, Fac Phys & Appl Informat, Dept Solid State Phys, Ul Pomorska 149-153, PL-90236 Lodz, Poland

关键词: Heisenberg model;    Pair Approximation;    Spin S=1;    Gibbs energy;    Magnetic properties;    2D magnetic semiconductor;   

DOI  :  10.1016/j.jmmm.2020.167157

来源: Elsevier

【 摘 要 】

The Pair Approximation method has been formulated for the isotropic ferromagnetic Heisenberg model with spin S = 1. The exchange interactions of arbitrary range have been taken into account. The single-ion anisotropy has been considered as well as the external magnetic field. Within the method, the Gibbs free-energy has been derived, from which all thermodynamic properties can be self-consistently obtained. In order to illustrate the developed formalism, the numerical calculations have been performed for CrIAs planar magnetic semiconductor, a hypothetical material whose existence has been recently predicted by the Density Functional Theory-based calculations. For this model material, all the relevant thermodynamic magnetic properties have been studied. The numerical results have been presented in the figures and discussed.

【 授权许可】

Free