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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Acknowledgements

This work was financially supported by the European Research Council (ERC) Advanced Grant (No. 291472) ‘IDEA Heusler!’ and ERC Advanced Grant (No. 742068) ‘TOPMAT’. E.L. acknowledges support from the Alexander von Humboldt Foundation of Germany for his Fellowship and from the National Natural Science Foundation of China for his Excellent Young Scholarship (No. 51722106).

Author information

Affiliations

  1. Max Planck Institute for Chemical Physics of Solids, Dresden, Germany

    • Enke Liu
    • , Yan Sun
    • , Nitesh Kumar
    • , Aili Sun
    • , Lin Jiao
    • , Qiunan Xu
    • , Johannes Kroder
    • , Vicky Süß
    • , Horst Borrmann
    • , Chandra Shekhar
    • , Walter Schnelle
    • , Steffen Wirth
    •  & Claudia Felser
  2. Institute of Physics, Chinese Academy of Sciences, Beijing, China

    • Enke Liu
    •  & Wenhong Wang
  3. Department of Chemistry, Princeton University, Princeton, NJ, USA

    • Lukas Muechler
  4. Max Planck Institute of Microstructure Physics, Halle, Germany

    • Shuo-Ying Yang
    •  & Defa Liu
  5. School of Physical Science and Technology, ShanghaiTech University, Shanghai, China

    • Aiji Liang
    •  & Yulin Chen
  6. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA

    • Aiji Liang
  7. High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, China

    • Zhaosheng Wang
    •  & Chuanying Xi
  8. Clarendon Laboratory, Department of Physics, University of Oxford, Oxford, UK

    • Yulin Chen
  9. Institut für Festkörper- und Material Physik, Technische Universität Dresden, Dresden, Germany

    • Sebastian T. B. Goennenwein

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Contributions

The project was conceived by E.L. and C.F. Single crystals were grown by E.L., who performed the structural, magnetic and transport measurements with assistance from A.S., J.K., S.Y., V.S., H.B., N.K. and W.S. The STM characterizations were performed by L.J. and S.W. The ARPES measurements were conducted by D.L., A.L. and Y.C. The static high-magnetic-field measurements were performed and analysed by Z.W., C.X., N.K., C.S. and L.J. The theoretical calculations were carried out by Y.S., L.M., Q.X. and E.L. All the authors discussed the results. The paper was written by E.L., Y.S. and S.T.B.G. with feedback from all the authors. The project was supervised by C.F.

Competing interests

The authors declare no competing interests.

Corresponding authors

Correspondence to Enke Liu or Yan Sun or Claudia Felser.

Supplementary information

  1. Supplementary information

    Supplementary figures S1 to S15, Supplementary tables S1 to S4, Supplementary references 1 to 31

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DOI

https://doi.org/10.1038/s41567-018-0234-5