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arXiv · 2609.14994

Heisenberg-like critical behavior in the quasi-two-dimensional metallic ferromagnet LaCrSb3

Qianhui Mao·Haotian Deng·Bin Chen·Jinhu Yang
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Abstract

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.

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Qianhui Mao, Haotian Deng, Bin Chen, Jinhu Yang. 2026-09-14. Heisenberg-like critical behavior in the quasi-two-dimensional metallic ferromagnet LaCrSb3. https://doi.org/10.7498/aps.75.20260404

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