发表机构
College of Science, Henan University of Engineering; Department of Physics, Hangzhou Normal University（河南工程学院理学院; 杭州师范大学物理系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过单晶等温磁化测量与临界行为分析，确定准二维金属铁磁体LaCrSb3的居里温度为126 K，其临界指数符合三维海森堡模型，并揭示各向同性直接交换作用主导其磁相变。
AI 中文摘要
LaCrSb3是一种同时表现出准二维自旋涨落和三维磁相互作用特性的材料。通过测量单晶的等温磁化强度并进行系统的临界行为分析，我们阐明了其铁磁相变的临界性质及内在的磁相互作用机制。基于在临界点附近测得的高精度等温磁化强度数据，利用基于Arrott-Noakes方程的自洽迭代方法，确定铁磁-顺磁相变的居里温度为TC = 126 K，得到的临界指数为β = 0.376、γ = 1.417和δ = 4.76。这些临界指数的可靠性通过Widom标度律、磁态标度方程及其他分析得到验证。与理论模型的比较表明，该体系中磁相变的临界行为基本属于三维海森堡模型的普适类。这一结论进一步由交换相互作用J(r)随距离的衰减行为所证实，揭示了各向同性直接交换相互作用在该体系中的主导作用。最后，借鉴其他准二维磁性材料的研究成果，本工作提出LaCrSb3可能在二维极限下表现出有限温度磁有序，从而具有重要的理论研究意义和广阔的实际应用前景。
英文摘要
LaCrSb3 is a material exhibiting both quasi-two-dimensional spin fluctuations and three-dimensional magnetic interaction characteristics. By measuring the isothermal magnetization of single-crystals and conducting a systematic critical behavior analysis, we clarify the critical properties of its ferromagnetic phase transition and the intrinsic magnetic interaction mechanism. Based on high-precision isothermal magnetization data measured in the vicinity of the critical point, the Curie temperature for the ferromagnetic-paramagnetic phase transition is determined to be TC = 126 K, with the critical exponents obtained as $β$ = 0.376, $γ$ = 1.417 and $δ$ = 4.76 via the self-consistent iterative method based on the Arrott-Noakes equation. The reliability of these critical exponents is verified by the Widom scaling law, the magnetic state scaling equation and other analyses. A comparison with theoretical models demonstrates that the critical behavior of the magnetic phase transition in this system basically belongs to the universality class of the three-dimensional Heisenberg model. This conclusion is further confirmed by the distance-dependent decay behavior of the exchange interaction J(r), revealing the dominant role of isotropic direct exchange interactions in this system. Finally, drawing on research findings of other quasi-two-dimensional magnetic materials, this work proposes that LaCrSb3 may exhibit finite-temperature magnetic order in the two-dimensional limit, thereby possessing important theoretical research significance and promising practical application prospects.
Journal refActa Phys. Sin., 2026, 75(10): 100706
