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arXiv · 2003.11327

Zero-field Nernst effect in a ferromagnetic kagome-lattice Weyl-semimetal Co3Sn2S2

Satya N. Guin·Praveen Vir·Yang Zhang·Nitesh Kumar·Sarah J. Watzman·Chenguang Fu·Enke Liu·Kaustuv Manna·Walter Schnelle·Johannes Gooth·Chandra Shekhar·Yan Sun·Claudia Felser
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Abstract

The discovery of magnetic topological semimetals recently attracted significant attention in the field of topology and thermoelectrics. In a thermoelectric device based on the Nernst geometry, an external magnet is required as an integral part. We report a zero-field Nernst effect in a newly discovered hard-ferromagnetic kagome-lattice Weyl-semimetal Co3Sn2S2. A maximum Nernst thermopower of 3 microvolt/K at 80 K in zero field is achieved in this magnetic Weyl-semimetal. Our results demonstrate the possibility of application of topological hard magnetic semimetals for low-power thermoelectric devices based on the Nernst effect and are thus valuable for the comprehensive understanding of transport properties in this class of materials.

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Satya N. Guin, Praveen Vir, Yang Zhang, Nitesh Kumar, Sarah J. Watzman, Chenguang Fu, Enke Liu, Kaustuv Manna, Walter Schnelle, Johannes Gooth, Chandra Shekhar, Yan Sun, Claudia Felser. 2020-03-25. Zero-field Nernst effect in a ferromagnetic kagome-lattice Weyl-semimetal Co3Sn2S2. https://doi.org/10.1002/adma.201806622

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