Spin freezing in the van der Waals material Mn2Ga2S5

doi:10.1088/1674-1056/ac657c

中国物理B ›› 2022, Vol. 31 ›› Issue (6): 67105-067105.doi: 10.1088/1674-1056/ac657c

Spin freezing in the van der Waals material Mn₂Ga₂S₅

Jie Shen(沈洁)^1,2, Xitong Xu(许锡童)¹, Miao He(何苗)^1,2, Yonglai Liu(刘永来)^1,2, Yuyan Han(韩玉岩)^1,2, and Zhe Qu(屈哲)^1,2,†

1 Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, CAS Key Laboratory of Photovoltaic and Energy Conservation Materials, High Magnetic Field Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China;
2 Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, China

收稿日期:2022-03-16 修回日期:2022-03-23 接受日期:2022-04-08 出版日期:2022-05-17 发布日期:2022-05-31
通讯作者: Zhe Qu E-mail:zhequ@hmfl.ac.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. U1832214, 11774007, U2032213, and 12104461).

Spin freezing in the van der Waals material Mn₂Ga₂S₅

Jie Shen(沈洁)^1,2, Xitong Xu(许锡童)¹, Miao He(何苗)^1,2, Yonglai Liu(刘永来)^1,2, Yuyan Han(韩玉岩)^1,2, and Zhe Qu(屈哲)^1,2,†

1 Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, CAS Key Laboratory of Photovoltaic and Energy Conservation Materials, High Magnetic Field Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China;
2 Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, China

Received:2022-03-16 Revised:2022-03-23 Accepted:2022-04-08 Online:2022-05-17 Published:2022-05-31
Contact: Zhe Qu E-mail:zhequ@hmfl.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. U1832214, 11774007, U2032213, and 12104461).

摘要/Abstract

摘要： Geometrical frustration in low-dimensional magnetic systems has been an intriguing research aspect, where the suppression of conventional magnetic order may lead to exotic ground states such as spin glass or spin liquid. In this work we report the synthesis and magnetism study of the monocrystalline Mn$_2$Ga$_2$S$_5$, featuring both the van der Waals structure and a bilayered triangular Mn lattice. Magnetic susceptibility reveals a significant antiferromagnetic interaction with a Curie-Weiss temperature $\theta_{\rm w}\sim-260$ K and a high spin $S=5/2$ Mn$^{2+}$ state. However, no long range magnetic order has been found down to 2 K, and a spin freezing transition is found to occur at around 12 K well below its $\theta_{\rm w}$. This yields a frustration index of $f = -\theta_{\rm w}/T_{\rm f} \approx 22$, an indication that the system is highly frustrated. The absence of a double-peak structure in magnetic specific heat compared with the $TM_2$S$_4$ compounds implies that the spin freezing behavior in Mn$_2$Ga$_2$S$_5$ is a result of the competition between exchange interactions and the 2D crystalline structure. Our results suggest that the layered Mn$_2$Ga$_2$S$_5$ would be an excellent candidate for investigating the physics of 2D magnetism and spin disordered state.

关键词: geometrical frustration, van der Waals material, spin freezing

Abstract: Geometrical frustration in low-dimensional magnetic systems has been an intriguing research aspect, where the suppression of conventional magnetic order may lead to exotic ground states such as spin glass or spin liquid. In this work we report the synthesis and magnetism study of the monocrystalline Mn$_2$Ga$_2$S$_5$, featuring both the van der Waals structure and a bilayered triangular Mn lattice. Magnetic susceptibility reveals a significant antiferromagnetic interaction with a Curie-Weiss temperature $\theta_{\rm w}\sim-260$ K and a high spin $S=5/2$ Mn$^{2+}$ state. However, no long range magnetic order has been found down to 2 K, and a spin freezing transition is found to occur at around 12 K well below its $\theta_{\rm w}$. This yields a frustration index of $f = -\theta_{\rm w}/T_{\rm f} \approx 22$, an indication that the system is highly frustrated. The absence of a double-peak structure in magnetic specific heat compared with the $TM_2$S$_4$ compounds implies that the spin freezing behavior in Mn$_2$Ga$_2$S$_5$ is a result of the competition between exchange interactions and the 2D crystalline structure. Our results suggest that the layered Mn$_2$Ga$_2$S$_5$ would be an excellent candidate for investigating the physics of 2D magnetism and spin disordered state.

Key words: geometrical frustration, van der Waals material, spin freezing

中图分类号: (Semiconductor compounds)

71.20.Nr

75.50.-y (Studies of specific magnetic materials) 75.50.Lk (Spin glasses and other random magnets)

Jie Shen(沈洁), Xitong Xu(许锡童), Miao He(何苗), Yonglai Liu(刘永来), Yuyan Han(韩玉岩), and Zhe Qu(屈哲). Spin freezing in the van der Waals material Mn₂Ga₂S₅[J]. 中国物理B, 2022, 31(6): 67105-067105.

Jie Shen(沈洁), Xitong Xu(许锡童), Miao He(何苗), Yonglai Liu(刘永来), Yuyan Han(韩玉岩), and Zhe Qu(屈哲). Spin freezing in the van der Waals material Mn₂Ga₂S₅[J]. Chin. Phys. B, 2022, 31(6): 67105-067105.

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Spin freezing in the van der Waals material Mn₂Ga₂S₅

Spin freezing in the van der Waals material Mn₂Ga₂S₅

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