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Nat Phys. 2018 Nov;14(11):1125-1131. doi: 10.1038/s41567-018-0234-5. Epub 2018 Jul 30.

Giant anomalous Hall effect in a ferromagnetic Kagomé-lattice semimetal.

Author information

1
Max-Planck Institute for Chemical Physics of Solids, Dresden, Germany.
2
Institute of Physics, Chinese Academy of Sciences, Beijing, China.
3
Department of Chemistry, Princeton University, Princeton, New Jersey, USA.
4
Max Planck Institute of Microstructure Physics, Halle, Germany.
5
School of Physical Science and Technology, ShanghaiTech University, Shanghai, China.
6
Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California, USA.
7
High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, Anhui, China.
8
Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford, UK.
9
Institut für Festkörper- und Material Physik, Technische Universität Dresden, Dresden, Germany.

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 Kagomé 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 nodes 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 significantly enhanced Berry curvature from its band structure, the anomalous Hall conductivity and the anomalous Hall angle simultaneously reach 1130 Ω-1 cm-1 and 20%, respectively, an order of magnitude larger than typical magnetic systems. Combining the Kagomé-lattice structure and the 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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