Impact of Spin-Entropy on the Thermoelectric Properties of a 2D Magnet
Alessandra Canetta (Université Catholique de Louvain)
Serhii Volosheniuk (Kavli institute of nanoscience Delft, TU Delft - QN/van der Zant Lab)
Sayooj Satheesh (Max Planck Institute for Solid State Research)
José Pedro Alvarinhas Batista (Université de Liège)
Aloïs Castellano (Université de Liège)
Riccardo Conte (TU Delft - QN/van der Zant Lab, Kavli institute of nanoscience Delft)
Daniel George Chica (Columbia University)
Herre S.J. van der Zant (TU Delft - QN/van der Zant Lab, Kavli institute of nanoscience Delft)
Pascal Gehring (Université Catholique de Louvain)
undefined More Authors (External organisation)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
Abstract
Heat-to-charge conversion efficiency of thermoelectric materials is closely linked to the entropy per charge carrier. Thus, magnetic materials are promising building blocks for highly efficient energy harvesters as their carrier entropy is boosted by a spin degree of freedom. In this work, we investigate how this spin-entropy impacts heat-to-charge conversion in the A-type antiferromagnet CrSBr. We perform simultaneous measurements of electrical conductance and thermocurrent while changing magnetic order using the temperature and magnetic field as tuning parameters. We find a strong enhancement of the thermoelectric power factor at around the Néel temperature. We further reveal that the power factor at low temperatures can be increased by up to 600% upon applying a magnetic field. Our results demonstrate that the thermoelectric properties of 2D magnets can be optimized by exploiting the sizable impact of spin-entropy and confirm thermoelectric measurements as a sensitive tool to investigate subtle magnetic phase transitions in low-dimensional magnets.