Effects of the geometric frustration on the ground-state and thermodynamic properties of the spin-1 Heisenberg model for an isotropic triangular lattice

IF 3 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Magnetism and Magnetic Materials Pub Date : 2025-02-01 DOI:10.1016/j.jmmm.2025.172836

Nguyen Van Hinh

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Abstract

We study the ground state and thermodynamic properties of the spin-1 antiferromagnetic Heisenberg model on an isotropic triangular lattice with nearest-neighbor

J_{1}

and next-nearest-neighbor

J_{2}

exchange interactions. The auxiliary fermionic representation of spin operators within the Popov-Fedotov functional integral formalism is used to calculate thermodynamic quantities. The Luttinger-Tisza procedure is used to represent the classical ground state energy in term of the magnetic order vector

Q

, which allows considering the contribution of fluctuations to the free energy of the system. The results obtained are compared with those of linear spin wave approximation and other methods. The effect of magnetic frustration on the sublattice magnetization, energy excitation spectrum and specific heat of the ordered magnetic phase will also be discussed in detail.

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几何挫折对各向同性三角形晶格自旋-1海森堡模型基态和热力学性质的影响

研究了具有最近邻J1和次近邻J2交换作用的各向同性三角形晶格上自旋-1反铁磁海森堡模型的基态和热力学性质。利用波波夫-费多托夫泛函积分形式中自旋算子的辅助费米子表示来计算热力学量。采用Luttinger-Tisza过程将经典基态能量表示为磁阶向量Q，从而考虑了系统的波动对自由能的贡献。所得结果与线性自旋波近似和其他方法的结果进行了比较。本文还详细讨论了磁挫折对有序磁相的亚晶格磁化强度、能量激发谱和比热的影响。

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来源期刊

Journal of Magnetism and Magnetic Materials 物理-材料科学：综合

CiteScore

5.30

自引率

11.10%

发文量

1149

审稿时长

59 days

期刊介绍： The Journal of Magnetism and Magnetic Materials provides an important forum for the disclosure and discussion of original contributions covering the whole spectrum of topics, from basic magnetism to the technology and applications of magnetic materials. The journal encourages greater interaction between the basic and applied sub-disciplines of magnetism with comprehensive review articles, in addition to full-length contributions. In addition, other categories of contributions are welcome, including Critical Focused issues, Current Perspectives and Outreach to the General Public. Main Categories: Full-length articles: Technically original research documents that report results of value to the communities that comprise the journal audience. The link between chemical, structural and microstructural properties on the one hand and magnetic properties on the other hand are encouraged. In addition to general topics covering all areas of magnetism and magnetic materials, the full-length articles also include three sub-sections, focusing on Nanomagnetism, Spintronics and Applications. The sub-section on Nanomagnetism contains articles on magnetic nanoparticles, nanowires, thin films, 2D materials and other nanoscale magnetic materials and their applications. The sub-section on Spintronics contains articles on magnetoresistance, magnetoimpedance, magneto-optical phenomena, Micro-Electro-Mechanical Systems (MEMS), and other topics related to spin current control and magneto-transport phenomena. The sub-section on Applications display papers that focus on applications of magnetic materials. The applications need to show a connection to magnetism. Review articles: Review articles organize, clarify, and summarize existing major works in the areas covered by the Journal and provide comprehensive citations to the full spectrum of relevant literature.