Co-doping modulated magnetocaloric effect and critical behavior of kagome MgMn6Sn6

IF 3.8 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of the American Ceramic Society Pub Date : 2025-08-06 DOI:10.1111/jace.70166

Zhengyi Li, Shuwei Liu, Xucai Kan, Ganhong Zheng, Zhenxiang Dai, Zhigao Sheng

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Abstract

Single crystals of MgMn_5.95Co_0.05Sn₆ were synthesized via the flux method, and their magnetic properties, magnetocaloric effects, and critical behavior were systematically investigated. Compared to the ferromagnetic (FM) MgMn₆Sn₆ parent compound, Co doping induces an antiferromagnetic-like low-magnetization state. The maximum magnetic entropy change $(| - Δ S_{M}^{\max} |)$ under ΔH = 50 kOe was determined as 2.87 J/kg·K (H//ab) and 2.57 J/kg·K (H//c). Scaling analysis of the magnetic entropy change curves revealed a field-dependent magnetic phase transition: a first-order transition dominates at low magnetic fields (H < 40 kOe), while a crossover to second-order behavior occurs at higher fields (H > 40 kOe). Critical exponents β, γ, and δ were derived using modified Arrott plots, Kouvel-Fisher analysis, and the Widom scaling relation (δ = 1 + γ/β), with consistency validated through the universal scaling equation m = f_±(h). The critical exponents for H//ab align closely with the 3D-Ising universality class, whereas those for H//c exhibit hybrid characteristics-proximity to the 3D-Heisenberg model below T_C and mean-field behavior above T_C. These findings highlight the anisotropic critical behavior and universality crossover induced by Co doping in the MgMn₆Sn₆ system.

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共掺杂调制kagome MgMn6Sn6的磁热效应和临界行为

采用磁通法合成了MgMn5.95Co0.05Sn6单晶，并对其磁性能、磁热效应和临界行为进行了系统研究。与铁磁性（FM） MgMn6Sn6母体化合物相比，Co掺杂诱导出类似反铁磁性的低磁化态。最大磁熵变化（|−Δ S M max |）$({| {- {{\Delta}}S_{\mathrm{M}}^{{\mathrm{max}}}} |})$在ΔH = 50 kOe下的取值为2.87 J/kg·K （H//ab）和2.57 J/kg·K （H//c）。磁熵变化曲线的标度分析揭示了一种依赖于磁场的磁相变：在低磁场（H < 40 kOe）下，一阶相变占主导地位，而在高磁场（H > 40 kOe）下，二阶行为发生交叉。利用改进的Arrott图、Kouvel-Fisher分析和Widom标度关系（δ = 1 + γ/β）推导出关键指数β、γ和δ，并通过通用标度方程m = f±(h)验证了一致性。H//ab的临界指数与3D-Ising普适性非常接近，而H//c的临界指数则表现出混合特征——接近3D-Heisenberg模型，低于TC，高于TC的平均场行为。这些发现突出了Co掺杂在MgMn6Sn6体系中引起的各向异性临界行为和普适性交叉。

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来源期刊

Journal of the American Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

7.50

自引率

7.70%

发文量

590

审稿时长

2.1 months

期刊介绍： The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials. Papers on fundamental ceramic and glass science are welcome including those in the following areas: Enabling materials for grand challenges[...] Materials design, selection, synthesis and processing methods[...] Characterization of compositions, structures, defects, and properties along with new methods [...] Mechanisms, Theory, Modeling, and Simulation[...] JACerS accepts submissions of full-length Articles reporting original research, in-depth Feature Articles, Reviews of the state-of-the-art with compelling analysis, and Rapid Communications which are short papers with sufficient novelty or impact to justify swift publication.