Giant anomalous Hall effect in a ferromagnetic kagome-lattice semimetal

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2018
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Liu, Enke
Sun, Yan
Kumar, Nitesh
Müchler, Lukas
Sun, Aili
Jiao, Lin
Yang, Shuo-Ying
Liu, Defa
Felser, Claudia
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Nature Physics. Springer Nature. 2018, 14(11), pp. 1125-1131. ISSN 1745-2473. eISSN 1745-2481. Available under: doi: 10.1038/s41567-018-0234-5
Zusammenfassung

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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530 Physik
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Electronic properties and materials, Magnetic properties and materials, Topological matter
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ISO 690LIU, Enke, Yan SUN, Nitesh KUMAR, Lukas MÜCHLER, Aili SUN, Lin JIAO, Shuo-Ying YANG, Defa LIU, Sebastian T. B. GOENNENWEIN, Claudia FELSER, 2018. Giant anomalous Hall effect in a ferromagnetic kagome-lattice semimetal. In: Nature Physics. Springer Nature. 2018, 14(11), pp. 1125-1131. ISSN 1745-2473. eISSN 1745-2481. Available under: doi: 10.1038/s41567-018-0234-5
BibTex
@article{Liu2018-11Giant-51908,
  year={2018},
  doi={10.1038/s41567-018-0234-5},
  title={Giant anomalous Hall effect in a ferromagnetic kagome-lattice semimetal},
  number={11},
  volume={14},
  issn={1745-2473},
  journal={Nature Physics},
  pages={1125--1131},
  author={Liu, Enke and Sun, Yan and Kumar, Nitesh and Müchler, Lukas and Sun, Aili and Jiao, Lin and Yang, Shuo-Ying and Liu, Defa and Goennenwein, Sebastian T. B. and Felser, Claudia}
}
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    <dcterms:abstract xml:lang="eng">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&lt;sub&gt;3&lt;/sub&gt;Sn&lt;sub&gt;2&lt;/sub&gt;S&lt;sub&gt;2&lt;/sub&gt;, 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&lt;sup&gt;-1&lt;/sup&gt; cm&lt;sup&gt;-1&lt;/sup&gt; 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 Co&lt;sub&gt;3&lt;/sub&gt;Sn&lt;sub&gt;2&lt;/sub&gt;S&lt;sub&gt;2&lt;/sub&gt;, we expect that this material is an excellent candidate for observation of the quantum anomalous Hall state in the two-dimensional limit.</dcterms:abstract>
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