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Ferromagnetism and anomalous Hall effect in MnBi<sub>6</sub>Te<sub>10</sub>

ORAL

Abstract


The (MnBi2Te4)(Bi2Te3)m (m=0, 1, 2, &3) system provides a rich platform for the study of various exotic quantum states, such as axion insulator (AI) and quantum anomalous Hall insulator (QAHI). With m increasing, the strength of interlayer magnetic exchange interaction gradually weakens. Previous studies have shown the magnetic state of this system changes from antiferromagnetic (AFM) orders for m=0, 1 and 2 to a ferromagnetic order (FM) for m=3. The m=2 member, MnBi6Te10 exhibits enhanced competition between AFM and FM coupling, and a FM order has been reported to be accessible via 30% Sb substitution for Bi [1]. In this talk, we report the successful growth of FM Mn(Bi1-xSbx)6Te10 (x = 0, 0.08, 0.12, 0.3) crystals. Some samples exhibit a large remnant magnetization (2.7 μB/Mn). Our experiments also reveal a large anomalous Hall effect for the x=0.3 sample; its anomalous Hall resistivity is ~ 10 μΩ cm, about 10 times larger than that previously reported value for the AFM MnBi6Te10. These FM compounds could be promising candidates for realizing the QAHI and AI.

Reference:
[1] J. Wu, F. Liu, C. Liu, Y. Wang, C. Li, Y. Lu, S. Matsuishi, and H. Hosono, Adv. Mater. 32, 2001815 (2020).

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Presenters

  • Yanglin Zhu

    The Pennsylvania State University, Physics, Penn State University, Pennsylvania State University, Department of Physics, Pennsylvania State University, Department of Physics, The Pennsylvania State University, Physics, The Pennsylvania State University

Authors

  • Yanglin Zhu

    The Pennsylvania State University, Physics, Penn State University, Pennsylvania State University, Department of Physics, Pennsylvania State University, Department of Physics, The Pennsylvania State University, Physics, The Pennsylvania State University

  • Zhiqiang Mao

    Pennsylvania State University, Department of Physics, Penn State University, The Pennsylvania State University, Penn State University, Physics, Penn State University, Department of Physics, Pennsylvania State University, Department of Physics, The Pennsylvania State University, Physics, The Pennsylvania State University, Physics, Pennsylvania State University, Department of Materials Science and Engineering, Pennsylvania State University