Topological charge-entropy scaling in kagome Chern magnet TbMn6Sn6

Xitong Xu, Jia-Xin Yin, Wenlong Ma, Hung-Ju Tien, Xiao-Bin Qiang, P. V. Sreenivasa Reddy, Huibin Zhou, Jie Shen, Hai-Zhou Lu, Tay-Rong Chang, Zhe Qu () and Shuang Jia ()
Additional contact information
Xitong Xu: Chinese Academy of Sciences
Jia-Xin Yin: Princeton University
Wenlong Ma: Peking University
Hung-Ju Tien: National Cheng Kung University
Xiao-Bin Qiang: Southern University of Science and Technology
P. V. Sreenivasa Reddy: National Cheng Kung University
Huibin Zhou: Peking University
Jie Shen: Chinese Academy of Sciences
Hai-Zhou Lu: Southern University of Science and Technology
Tay-Rong Chang: National Cheng Kung University
Zhe Qu: Chinese Academy of Sciences
Shuang Jia: Peking University

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract In ordinary materials, electrons conduct both electricity and heat, where their charge-entropy relations observe the Mott formula and the Wiedemann-Franz law. In topological quantum materials, the transverse motion of relativistic electrons can be strongly affected by the quantum field arising around the topological fermions, where a simple model description of their charge-entropy relations remains elusive. Here we report the topological charge-entropy scaling in the kagome Chern magnet TbMn6Sn6, featuring pristine Mn kagome lattices with strong out-of-plane magnetization. Through both electric and thermoelectric transports, we observe quantum oscillations with a nontrivial Berry phase, a large Fermi velocity and two-dimensionality, supporting the existence of Dirac fermions in the magnetic kagome lattice. This quantum magnet further exhibits large anomalous Hall, anomalous Nernst, and anomalous thermal Hall effects, all of which persist to above room temperature. Remarkably, we show that the charge-entropy scaling relations of these anomalous transverse transports can be ubiquitously described by the Berry curvature field effects in a Chern-gapped Dirac model. Our work points to a model kagome Chern magnet for the proof-of-principle elaboration of the topological charge-entropy scaling.

Date: 2022
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DOI: 10.1038/s41467-022-28796-6

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