Giant anomalous Hall effect in a ferromagnetic kagome-lattice semimetal

Liu, Enke; Sun, Yan; Kumar, Nitesh; Müchler, Lukas; Sun, Aili; Jiao, Lin; Yang, Shuo-Ying; Liu, Defa; Gönnenwein, Sebastian T. B.; Felser, Claudia

Giant anomalous Hall effect in a ferromagnetic kagome-lattice semimetal

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Datum

2018

Autor:innen

Liu, Enke

Sun, Yan

Kumar, Nitesh

Müchler, Lukas

Sun, Aili

Jiao, Lin

Yang, Shuo-Ying

Liu, Defa

Gönnenwein, Sebastian T. B.

Felser, Claudia

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Nature Physics ; 14 (2018), 11. - S. 1125-1131. - Springer Nature. - ISSN 1745-2473. - eISSN 1745-2481

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.

Fachgebiet (DDC)

530 Physik

Schlagwörter

Electronic properties and materials, Magnetic properties and materials, Topological matter

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ISO 690

LIU, Enke, Yan SUN, Nitesh KUMAR, Lukas MÜCHLER, Aili SUN, Lin JIAO, Shuo-Ying YANG, Defa LIU, Sebastian T. B. GÖNNENWEIN, Claudia FELSER, 2018. Giant anomalous Hall effect in a ferromagnetic kagome-lattice semimetal. In: Nature Physics. Springer Nature. 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 Gönnenwein, 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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