Critical behavior in the Mn5Ge3 ferromagnet

Europhysics Letters Pub Date : 2024-02-27 DOI:10.1209/0295-5075/ad2d87

Jun-Fa lin, Huan Wang, Sheng Xu, Xiao-Yan Wang, Xiangtao Zeng, Zhengsheng Dai, Jing Gong, Kun Han, Yi-Ting Wang, Xiao Ma, Tian-Long Xia

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Abstract

High-Curie-temperature ferromagnets are promising candidates for designing new spintronic devices. Here we have successfully synthesized the single crystal of the itinerant ferromagnet Mn5Ge3 using ﬂux method. Its critical properties were investigated by means of bulk dc-magnetization at the boundary of the paramagnetic (PM) and ferromagnetic (FM) phase to determine intrinsic magnetic interactions. Critical exponents β = 0.336 0.001 with a critical temperature Tc = 300.29 0.01 K and γ = 1.193 0.003 with Tc = 300.15 0.05 K are acquired by the modiﬁed Arrott plot, whereas δ = 4.61 0.03 is deduced by a critical isotherm analysis at Tc = 300 K. The self-consistency and reliability of these critical exponents are veriﬁed by the Widom scaling law and the scaling equations. Further analysis reveals that the spin interaction in Mn5Ge3 exhibits three-dimensional Ising-like behavior. The magnetic exchange interaction is found to decay as J(r) r-4.855, meaning that the spin interactions exceed the nearest neighbors, which may be related to the different Mn–Mn interactions with inequal exchange strengths.

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Mn5Ge3 铁磁体的临界行为

高温铁磁体是设计新型自旋电子器件的理想候选材料。在这里，我们采用 FLUX 方法成功合成了巡回铁磁体 Mn5Ge3 的单晶体。通过在顺磁（PM）和铁磁（FM）相边界进行体直流磁化，研究了它的临界特性，以确定内在的磁相互作用。临界指数β = 0.336 0.001（临界温度 Tc = 300.29 0.01 K）和γ = 1.193 0.003（临界温度 Tc = 300.15 0.05 K）是通过修正的阿罗特曲线图获得的，而δ = 4.61 0.03 则是在 Tc = 300 K 时通过临界等温线分析推导出来的。进一步的分析表明，Mn5Ge3 中的自旋相互作用表现出类似 Ising 的三维行为。磁交换相互作用衰减为 J(r) r-4.855，这意味着自旋相互作用超过了近邻相互作用，这可能与具有不平等交换强度的不同锰-锰相互作用有关。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Europhysics Letters

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