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Two-dimensional Sb net generated nontrivial topological states in SmAgSb2 probed by quantum oscillations |
| Jian Yuan(袁健)1, Xian-Biao Shi(石贤彪)2,†, Hong Du(杜红)3, Tian Li(李田)4, Chuan-Ying Xi(郗传英)5, Xia Wang(王霞)1, Wei Xia(夏威)1,6,‡, Bao-Tian Wang(王保田)2, Rui-Dan Zhong(钟瑞丹)3,§, and Yan-Feng Guo(郭艳峰)1,6 |
1 School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China;
2 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;
3 Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 200240, China;
4 Xingzhi College, Zhejiang Normal University, Jinhua 321100, China;
5 Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory of the Chinese Academy of Sciences, Hefei 230031, China;
6 ShanghaiTech Laboratory for Topological Physics, ShanghaiTech University, Shanghai 201210, China |
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Abstract The REAgSb$_{2}$ ($RE = {\rm rare}$ earth and Y) family has drawn considerable research interest because the two-dimensional Sb net in their crystal structures hosts topological fermions and hence rich topological properties. We report herein the magnetization and magnetotransport measurements of SmAgSb$_{2}$ single crystal, which unveil very large magnetoresistance and high carrier mobility up to $6.2\times 10^{3}%$ and $5.58\times 10^{3}$ cm$^{2}\cdot$V$^{-1}\cdot$s$^{-1}$, respectively. The analysis of both Shubnikov-de Haas and de Haas-van Alphen quantum oscillations indicates nontrivial Berry phases in the paramagnetic state while trivial Berry curvature in the antiferromagnetic state, indicating a topological phase transition induced by the antiferromagnetic order. It is also supported by the first-principles calculations. The results not only provide a new interesting topological material but also offer valuable insights into the correlation between magnetism and nontrivial topological states.
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Received: 08 May 2024
Revised: 13 May 2024
Accepted manuscript online: 15 May 2024
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PACS:
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71.20.Eh
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(Rare earth metals and alloys)
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75.47.-m
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(Magnetotransport phenomena; materials for magnetotransport)
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75.50.Ee
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(Antiferromagnetics)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12004405, 12334008, and 12374148), the Double First-Class Initiative Fund of ShanghaiTech University, and the Analytical Instrumentation Center of ShanghaiTech University (Grant No. SPST-AIC10112914). W. Xia acknowledges the research fund from the Shanghai Sailing Program (Grant No. 23YF1426900). R. D. Zhong acknowledges the fund from the National Key R&D Program of China (Grant Nos. 2022YFA1402702 and 2021YFA1401600). |
Corresponding Authors:
Xian-Biao Shi, Wei Xia, Rui-Dan Zhong
E-mail: shixb@ihep.ac.cn;xiawei2@shanghaitech.edu.cn;rzhong@sjtu.edu.cn
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Cite this article:
Jian Yuan(袁健), Xian-Biao Shi(石贤彪), Hong Du(杜红), Tian Li(李田), Chuan-Ying Xi(郗传英), Xia Wang(王霞), Wei Xia(夏威), Bao-Tian Wang(王保田), Rui-Dan Zhong(钟瑞丹), and Yan-Feng Guo(郭艳峰) Two-dimensional Sb net generated nontrivial topological states in SmAgSb2 probed by quantum oscillations 2024 Chin. Phys. B 33 077102
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