[en] 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.
Disciplines :
Physics
Author, co-author :
Canetta, Alessandra ; Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain (UCLouvain), 1348 Louvain-la-Neuve, Belgium
Volosheniuk, Serhii; Kavli Institute of Nanoscience, Delft University of Technology, 2628CJ Delft, The Netherlands
Satheesh, Sayooj; Max-Planck-Institut für Festkörperforschung, D-70569 Stuttgart, Germany
Alvarinhas Batista, José Pedro ; Université de Liège - ULiège > Complex and Entangled Systems from Atoms to Materials (CESAM)
Castellano, Aloïs ; Université de Liège - ULiège > Département de physique > Physique des matériaux et nanostructures
Conte, Riccardo; Kavli Institute of Nanoscience, Delft University of Technology, 2628CJ Delft, The Netherlands
Chica, Daniel George; Department of Chemistry, Columbia University, New York, New York 10027, United States
Watanabe, Kenji ; Research Center for Electronic and Optical Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
Taniguchi, Takashi ; Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
Roy, Xavier ; Department of Chemistry, Columbia University, New York, New York 10027, United States
van der Zant, Herre S J ; Kavli Institute of Nanoscience, Delft University of Technology, 2628CJ Delft, The Netherlands
Burghard, Marko; Max-Planck-Institut für Festkörperforschung, D-70569 Stuttgart, Germany
Verstraete, Matthieu ; Université de Liège - ULiège > Département de physique > Physique des matériaux et nanostructures ; ITP, Physics Department, Utrecht University, 3508 TA Utrecht, The Netherlands
Gehring, Pascal ; Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain (UCLouvain), 1348 Louvain-la-Neuve, Belgium
ERC - European Research Council MEXT - Ministry of Education, Culture, Sports, Science and Technology FWB - Fédération Wallonie-Bruxelles DFG - Deutsche Forschungsgemeinschaft EU - European Union FWO - Fonds Wetenschappelijk Onderzoek Vlaanderen JSPS - Japan Society for the Promotion of Science NIMM - National Institute for Materials Science F.R.S.-FNRS - Fonds de la Recherche Scientifique NWO - Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Funding text :
P.G. acknowledges financial support from the F.R.S.-FNRS of Belgium (FNRS-CQ-1.C044.21-SMARD, FNRS-CDR-J.0068.21-SMARD, FNRS-MIS-F.4523.22-TopoBrain), and from the EU (ERC-StG-10104144-MOUNTAIN). P.G., A.C., A.Castellano, J.A-B., and M.V. acknowledge funding from the Federation Wallonie-Bruxelles through the ARC Grant No. 21/26-116, and from the FWO and FRS-FNRS under the Excellence of Science (EOS) programme (40007563-CONNECT). H.v.d.Z. acknowledges support by the FET open project QuIET (Number 767187) and by The Netherlands Organisation for Scientific Research (NWO). K.W. and T.T. acknowledge support from the JSPS KAKENHI (Grant Numbers 21H05233 and 23H02052) and World Premier International Research Center Initiative (WPI), MEXT, Japan for the growth of h-BN crystals. M.B. is grateful for support from the Deutsche Forschungsgemeinschaft (DFG) via Grant BU 1125/11-1. M.V. acknowledges a PRACE award granting access to MareNostrum4 at Barcelona Supercomputing Center (BSC), Spain and Discoverer in SofiaTech, Bulgaria (OptoSpin project id. 2020225411). Synthetic work at Columbia was supported by the National Science Foundation (NSF) through the Columbia Materials Science and Engineering Research Center on Precision-Assembled Quantum Materials (DMR-2011738).
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