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.
@article{arxiv.2003.11327,
title = {Zero-field Nernst effect in a ferromagnetic kagome-lattice Weyl-semimetal Co3Sn2S2},
author = {Satya N. Guin and Praveen Vir and Yang Zhang and Nitesh Kumar and Sarah J. Watzman and Chenguang Fu and Enke Liu and Kaustuv Manna and Walter Schnelle and Johannes Gooth and Chandra Shekhar and Yan Sun and Claudia Felser},
journal= {arXiv preprint arXiv:2003.11327},
year = {2020}
}