Multiple Magnetic Phase Transitions and Critical Behavior in Single-Crystal SmMn$_{2}$Ge$_{2}$
Xiao-Yan Wang1,2 , Jun-Fa Lin1,2 , Xiang-Yu Zeng1,2 , Huan Wang1,2 , Xiao-Ping Ma1,2 , Yi-Ting Wang1,2 , Kun Han1,2 , and Tian-Long Xia1,2,3,4*
1 Department of Physics, Renmin University of China, Beijing 100872, China2 Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China3 Key Laboratory of Quantum State Construction and Manipulation (Ministry of Education), Renmin University of China, Beijing 100872, China4 Laboratory for Neutron Scattering, Renmin University of China, Beijing 100872, China
Abstract ：Magnetic materials with noncollinear spin configurations have engendered significant interest in condensed matter physics due to their intriguing physical properties. We direct our attention towards the magnetic properties and critical behavior of single-crystal SmMn$_{2}$Ge$_{2}$, an itinerant magnet with numerous temperature-dependent magnetic phase transitions. Notably, SmMn$_{2}$Ge$_{2}$ displays significant magnetic anisotropy with easy magnetization direction switching from the $c$ axis to the $ab$ plane as temperature decreases. The critical behavior of the ferromagnetic transition occurring above room temperature is thoroughly examined. Reliable and self-consistent critical exponents, including $\beta = 0.292(2)$, $\gamma=0.924(8)$, and $\delta = 4.164(6)$, along with the Curie temperature $T_{\rm c}=347$ K, are extracted through various methods, which provide evidence for the coexistence of multiple magnetic interactions in SmMn$_{2}$Ge$_{2}$. Further analysis reveals that the magnetic interaction of SmMn$_{2}$Ge$_{2}$ is a long-range type with the interaction distance decaying as $J(r)\sim r^{-4.35}$.
收稿日期: 2023-04-16
出版日期: 2023-06-01
:
75.40.Cx
(Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.))
75.50.-y
(Studies of specific magnetic materials)
81.10.Fq
(Growth from melts; zone melting and refining)
引用本文:
. [J]. 中国物理快报, 2023, 40(6): 67503-.
链接本文:
https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/40/6/067503
或
https://cpl.iphy.ac.cn/CN/Y2023/V40/I6/67503
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