Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session M72: Mn-Te Magnetic Topology III
8:00 AM–10:36 AM,
Wednesday, March 16, 2022
Room: Hyatt Regency Hotel -Jackson Park D
Sponsoring
Units:
DMP GMAG DCMP
Chair: Max Hirschberger, University of Tokyo; Jun Xiao, University of Wisconsin - Madison
Abstract: M72.00010 : Evidence of a ferromagnetic Weyl semimetal in Mn(Bi,Sb)4Te7*
10:12 AM–10:24 AM
Presenter:
Yingdong Guan
(Pennsylvania State University)
Authors:
Yingdong Guan
(Pennsylvania State University)
Seng Huat Lee
(Pennsylvania State University)
Zhiqiang Mao
(Pennsylvania State University)
Intrinsic antiferromagnetic topological insulators MnBi2nTe3n+1 (n=1, 2, 3) is one of the model material systems to explore exotic topological quantum states such as layer-independent quantum anomalous Hall insulator and axion insulator [1, 2]. Recently, Mn(Bi,Sb)4Te7 (MBST) is predicted to host a Weyl semimetal state in its ferromagnetic(FM) phase [3, 4]. In this talk, we will report the successful growth of the FM MBST system. Furthermore, we will also show both the carrier type and carrier concentration of this system can be controlled by tuning the Sb concentration. Our magnetotransport measurements reveal a transport signature of the predicted Weyl state in the lightly hole doped samples – chiral anomaly, as manifested by large negative longitudinal magnetoresistance. In contrast, the chiral anomaly effect is not observed in electron-doped or heavily hole doped samples, indicating the Weyl nodes are accessible only when the chemical potential is close to the valence band top.
This work was supported by the US Department of Energy under grants DE-SC0019068.
References:
1. Liu et al., Nature Mater. 19, 522-527 (2020)
2. Deng et al., Science 367.6480:895-900 (2020)
3. Hu et al., PRB, 104, 054422 (2021)
4. Vidal et al., PRX, 9, 041065 (2019)
*This work was supported by the US Department of Energy under grants DE-SC0019068.
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