Zero‐Field Nernst Effect in a Ferromagnetic Kagome‐Lattice Weyl‐Semimetal Co3Sn2S2

• Published in: Advanced materials (Weinheim) 2019-06, Vol.31 (25), p.n/a
• Main Authors: Guin, Satya N., Vir, Praveen, Zhang, Yang, Kumar, Nitesh, Watzman, Sarah J., Fu, Chenguang, Liu, Enke, Manna, Kaustuv, Schnelle, Walter, Gooth, Johannes, Shekhar, Chandra, Sun, Yan, Felser, Claudia
• Format: Article
• Language: English
• Subjects: Ferromagnetism; hard magnets; magnetic Weyl‐semimetals; Materials science; Metalloids; Nernst effect; Nernst-Ettingshausen effect; Thermoelectricity; thermoelectrics; Topology; Transport properties; zero‐field Nernst thermopower
• ISSN: 0935-9648; 1521-4095
• DOI: 10.1002/adma.201806622

The discovery of magnetic topological semimetals has 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. Reported is a zero‐field Nernst effect in a newly discovered hard‐ferromagnetic kagome‐lattice Weyl‐semimetal Co3Sn2S2. A maximum Nernst thermopower of ≈3 µV K−1 at 80 K in zero field is achieved in this magnetic Weyl‐semimetal. The 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. A zero‐field Nernst effect in the ferromagnetic Weyl‐semimetal Co3Sn2S2 is reported. A maximum Nernst thermopower of ≈3 µV K−1 at 80 K in zero field is achieved. This study shows the potential of the search for new hard magnets from the library of topological materials for the generation of larger and potentially useful levels of Nernst thermopower.