混合自旋-3和自旋-5/2 blme - capel模型的铁磁特性和自旋补偿温度

IF 0.6 Q4 PHYSICS, MULTIDISCIPLINARY

Ukrainian Journal of Physics Pub Date : 2022-12-21 DOI:10.15407/ujpe67.9.695

I. A. Obaid, H. Mohamad, Shakir D. Al-Saeedi

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引用次数: 0

摘要

在Blume–Capel模型中，我们研究了基于混合自旋为-3和5/2的铁磁体的吉布斯–Bogolyubov自由能函数的分子平均场论（MMFT）。我们已经根据试验哈密顿算子评估了自由能。通过最小化本系统的自由能，我们获得了低温范围内的纵向磁化、补偿温度和再入行为的特征。特别地，我们研究了磁各向异性对所提出的模型的临界现象的影响。还讨论了自由能函数的子晶格磁化依赖性。我们的结果预测了在正方形晶格的无序Blume–Capel系统中存在多个自旋补偿点。

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Ferrimagnetic Characteristics and Spin Compensation Temperatures of a Mixed Spin-3 and Spin-5/2 Blume–Capel Model

We study the molecular mean-field theory (MMFT) based on the Gibbs–Bogolyubov free energy function of a ferrimagnetic with mixed spin-3 and spin-5/2 for various magnetic crystal fields in the Blume–Capel model. We have evaluated the free energy depending on the trial Hamiltonian operator. By minimizing the free energy of the present system, we have obtained the characteristic features of the longitudinal magnetizations, compensation temperatures, and re-entrant behaviors in the ranges of low temperatures. In particular, we study the effect of magnetic anisotropies on the critical phenomena for the proposed model. The sublattice magnetization dependence of the free energy function has been discussed as well. Our results predict the existence of multiple spin compensation points in the disordered Blume–Capel system for a square lattice.

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来源期刊

Ukrainian Journal of Physics PHYSICS, MULTIDISCIPLINARY-

CiteScore

1.20

自引率

20.00%

发文量

244

期刊介绍： Ukrainian Journal of Physics is the general physics edition of the Department of Physics and Astronomy of the National Academy of Sciences of Ukraine. The journal publishes original papers and reviews in the fields of experimental and theoretical physics.