R2RhIn8 （R = Nd, Tb, Dy, Ho）化合物的超磁跃迁：四亚晶格模型方法

IF 2.5 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials Pub Date : 2025-03-21 DOI:10.1016/j.jmmm.2025.172995

J.A. daSilva-Santos , J.M. Santos , E.J.R. Plaza , V.S.R. de Sousa , N.O. Moreno

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引用次数: 0

摘要

本文研究了R2RhIn8 （R = Nd, Tb, Dy, Ho）系列化合物的超磁跃迁。这些化合物结晶为具有P4/mmm空间基团的四方ho2coga8型结构。为了复制超磁跃迁，采用了一个包含晶体电场相互作用和分子场近似内交换相互作用的四亚晶格哈密顿模型。通过拟合和模拟Tb2RhIn8、Dy2RhIn8和Ho2RhIn8的等温磁化曲线，确定了它们的CEF参数。Nd2RhIn8 CEF参数取自文献。调整了交换相互作用参数，使模型与实验数据的一致性达到最佳。这个四亚晶格模型有效地再现了R2RhIn8 （R = Nd, Tb, Dy, Ho）系列化合物中观察到的低场变磁跃迁。

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Metamagnetic transitions in R2RhIn8 (R = Nd, Tb, Dy, Ho) compounds: A four-sublattice model approach

This work investigates the metamagnetic transitions observed in the R₂RhIn₈ (R = Nd, Tb, Dy, Ho) series of compounds. These compounds crystallize in the tetragonal Ho₂CoGa₈-type structure with the P4/mmm space group. To replicate the metamagnetic transitions a four-sublattice Hamiltonian model which incorporates the crystalline electric field (CEF) interaction and the exchange interaction within the molecular field approximation is employed. The CEF parameters for Tb₂RhIn₈, Dy₂RhIn₈, and Ho₂RhIn₈ were determined by fitting and simulating their isothermal magnetization curves. The Nd₂RhIn₈ CEF parameters were taken from the literature. The exchange interaction parameters were adjusted to optimize the agreement between the model and experimental data. This four sublattice model effectively reproduces the low-field metamagnetic transitions observed in the R₂RhIn₈ (R = Nd, Tb, Dy, Ho) series of compounds.

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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.