Large magnon-induced anomalous Nernst conductivity in single-crystal MnBi

He B, Sahin C, Boona SR, Sales BC, Pan Y, Felser C, Flatte ME, Heremans JP (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Joule Elsevier

Book Volume: 5

Pages Range: 3057-3067

Journal Issue: 11

DOI: 10.1016/j.joule.2021.08.007

Abstract

Thermoelectric modules are a promising approach to energy harvesting and efficient cooling. In addition to the longitudinal Seebeck effect, transverse devices utilizing the anomalous Nernst effect (ANE) have recently attracted interest. For high conversion efficiency, it is required that the material have a large ANE thermoelectric power and low electrical resistance, which lead to the conductivity of the ANE. ANE is usually explained in terms of intrinsic contributions from Berry curvature. Our observations suggest that extrinsic contributions also matter. Studying single-crystal manganese-bismuth (MnBi), we find a high ANE thermopower (∼10 μV/K) under 0.6 T at 80 K, and a transverse thermoelectric conductivity of over 40 A/Km. With insight from theoretical calculations, we attribute this large ANE predominantly to a new advective magnon contribution arising from magnon-electron spin-angular momentum transfer. We propose that introducing a large spin-orbit coupling into ferromagnetic materials may enhance the ANE through the extrinsic contribution of magnons.

Involved external institutions

Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids DE Germany (DE) University of Chicago US United States (USA) (US) Ohio State University US United States (USA) (US) Oak Ridge National Laboratory US United States (USA) (US)

How to cite

APA:

He, B., Sahin, C., Boona, S.R., Sales, B.C., Pan, Y., Felser, C.,... Heremans, J.P. (2021). Large magnon-induced anomalous Nernst conductivity in single-crystal MnBi. Joule, 5(11), 3057-3067. https://doi.org/10.1016/j.joule.2021.08.007

MLA:

He, Bin, et al. "Large magnon-induced anomalous Nernst conductivity in single-crystal MnBi." Joule 5.11 (2021): 3057-3067.

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