中国物理B ›› 2024, Vol. 33 ›› Issue (7): 77102-077102.doi: 10.1088/1674-1056/ad4bc2

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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. 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
  • 收稿日期:2024-05-08 修回日期:2024-05-13 接受日期:2024-05-15 出版日期:2024-06-18 发布日期:2024-06-28
  • 通讯作者: Xian-Biao Shi, Wei Xia, Rui-Dan Zhong E-mail:shixb@ihep.ac.cn;xiawei2@shanghaitech.edu.cn;rzhong@sjtu.edu.cn
  • 基金资助:
    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).

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. 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
  • Received:2024-05-08 Revised:2024-05-13 Accepted:2024-05-15 Online:2024-06-18 Published:2024-06-28
  • Contact: Xian-Biao Shi, Wei Xia, Rui-Dan Zhong E-mail:shixb@ihep.ac.cn;xiawei2@shanghaitech.edu.cn;rzhong@sjtu.edu.cn
  • Supported by:
    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).

摘要: 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.

关键词: large magnetoresistance, quantum oscillations, topological phase transition

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.

Key words: large magnetoresistance, quantum oscillations, topological phase transition

中图分类号:  (Rare earth metals and alloys)

  • 71.20.Eh
75.47.-m (Magnetotransport phenomena; materials for magnetotransport) 75.50.Ee (Antiferromagnetics)