Giant anomalous Hall effect in a ferromagnetic kagome-lattice semimetal

Liu E, Sun Y, Kumar N, Muechler L, Sun A, Jiao L, Yang SY, Liu D, Liang A, Xu Q, Kroder J, Suess V, Borrmann H, Shekhar C, Wang Z, Xi C, Wang W, Schnelle W, Wirth S, Chen Y, Goennenwein STB, Felser C (2018)

Publication Type: Journal article

Publication year: 2018

Journal

Nature Physics Nature Research

Book Volume: 14

Pages Range: 1125-1131

Journal Issue: 11

DOI: 10.1038/s41567-018-0234-5

Abstract

Magnetic Weyl semimetals with broken time-reversal symmetry are expected to generate strong intrinsic anomalous Hall effects, due to their large Berry curvature. Here, we report a magnetic Weyl semimetal candidate, Co 3 Sn 2 S 2 , with a quasi-two-dimensional crystal structure consisting of stacked kagome lattices. This lattice provides an excellent platform for hosting exotic topological quantum states. We observe a negative magnetoresistance that is consistent with the chiral anomaly expected from the presence of Weyl fermions close to the Fermi level. The anomalous Hall conductivity is robust against both increased temperature and charge conductivity, which corroborates the intrinsic Berry-curvature mechanism in momentum space. Owing to the low carrier density in this material and the considerably enhanced Berry curvature from its band structure, the anomalous Hall conductivity and the anomalous Hall angle simultaneously reach 1,130 Ω −1 cm −1 and 20%, respectively, an order of magnitude larger than typical magnetic systems. Combining the kagome-lattice structure and the long-range out-of-plane ferromagnetic order of Co 3 Sn 2 S 2 , we expect that this material is an excellent candidate for observation of the quantum anomalous Hall state in the two-dimensional limit.

Involved external institutions

Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids DE Germany (DE) Princeton University US United States (USA) (US) Max-Planck-Institut für Mikrostrukturphysik (MSP) / Max Planck Institute for Microstructure Physics DE Germany (DE) ShanghaiTech University / 上海科技大学 CN China (CN) Chinese Academy of Sciences (CAS) / 中国科学院 CN China (CN) Technische Universität Dresden DE Germany (DE)

How to cite

APA:

Liu, E., Sun, Y., Kumar, N., Muechler, L., Sun, A., Jiao, L.,... Felser, C. (2018). Giant anomalous Hall effect in a ferromagnetic kagome-lattice semimetal. Nature Physics, 14(11), 1125-1131. https://doi.org/10.1038/s41567-018-0234-5

MLA:

Liu, Enke, et al. "Giant anomalous Hall effect in a ferromagnetic kagome-lattice semimetal." Nature Physics 14.11 (2018): 1125-1131.

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