Electrical engineering

Physics

Electrode

Nernst equation

Topology (electrical circuits)

Weyl semimetal

Ferromagnetism

Nernst effect

Seebeck coefficient

Magnetic field

Engineering

Semimetal

Band gap

Materials science

Thermoelectric materials

Condensed matter physics

Quantum mechanics

Thermoelectric effect

Advanced Materials

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 Co3 Sn2 S2 . 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.

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