TY - JOUR
T1 - Giant anomalous Hall effect in a ferromagnetic kagome-lattice semimetal
AU - Liu, Enke
AU - Sun, Yan
AU - Kumar, Nitesh
AU - Muechler, Lukas
AU - Sun, Aili
AU - Jiao, Lin
AU - Yang, Shuo Ying
AU - Liu, Defa
AU - Liang, Aiji
AU - Xu, Qiunan
AU - Kroder, Johannes
AU - Süß, Vicky
AU - Borrmann, Horst
AU - Shekhar, Chandra
AU - Wang, Zhaosheng
AU - Xi, Chuanying
AU - Wang, Wenhong
AU - Schnelle, Walter
AU - Wirth, Steffen
AU - Chen, Yulin
AU - Goennenwein, Sebastian T.B.
AU - Felser, Claudia
N1 - Funding Information:
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).
Publisher Copyright:
© 2018, The Author(s).
PY - 2018/11/1
Y1 - 2018/11/1
N2 - 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.
AB - 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.
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U2 - 10.1038/s41567-018-0234-5
DO - 10.1038/s41567-018-0234-5
M3 - Article
AN - SCOPUS:85051102434
VL - 14
SP - 1125
EP - 1131
JO - Nature Physics
JF - Nature Physics
SN - 1745-2473
IS - 11
ER -