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  Giant anomalous Hall effect in a ferromagnetic kagome-lattice semimetal

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

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-DD82-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-7363-D
Genre: Journal Article

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 Creators:
Liu, Enke1, Author              
Sun, Yan1, Author              
Kumar, Nitesh1, Author              
Muechler, Lukas2, Author
Sun, Aili1, Author              
Jiao, Lin3, Author              
Yang, Shuo-Ying2, Author
Liu, Defa2, Author
Liang, Aiji2, Author
Xu, Qiunan1, Author              
Kroder, Johannes1, Author              
Süß, Vicky1, Author              
Borrmann, Horst4, Author              
Shekhar, Chandra5, Author              
Wang, Zhaosheng2, Author
Xi, Chuanying2, Author
Wang, Wenhong2, Author
Schnelle, Walter6, Author              
Wirth, Steffen7, Author              
Chen, Yulin2, Author
Goennenwein, Sebastian T. B.2, AuthorFelser, Claudia8, Author               more..
Affiliations:
1Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
2External Organizations, ou_persistent22              
3Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
4Horst Borrmann, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863410              
5Chandra Shekhar, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863428              
6Walter Schnelle, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863441              
7Steffen Wirth, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863460              
8Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 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, Co3Sn2S2, 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 Co3Sn2S2, we expect that this material is an excellent candidate for observation of the quantum anomalous Hall state in the two-dimensional limit.

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Language(s): eng - English
 Dates: 2018-07-302018-07-30
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1038/s41567-018-0234-5
 Degree: -

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Title: Nature Physics
  Other : Nat. Phys.
Source Genre: Journal
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Publ. Info: London : Nature Pub. Group
Pages: - Volume / Issue: 14 Sequence Number: - Start / End Page: 1125 - 1131 Identifier: ISSN: 1745-2473
CoNE: /journals/resource/1000000000025850