Large anomalous Nernst effect at room temperature in a chiral antiferromagnet
Open accessAbstract
The anomalous Nernst effect is usually associated with ferromagnets — enabling a temperature gradient to generate a transverse electric field — but the Berry curvature associated with Weyl points can drive this phenomenon in chiral antiferromagnets. A temperature gradient in a ferromagnetic conductor can generate a transverse voltage drop perpendicular to both the magnetization and heat current. This anomalous Nernst effect has been considered to be proportional to the magnetization1,2,3,4,5,6,7, and thus observed only in ferromagnets. Theoretically, however, the anomalous Nernst effect provides a measure of the Berry curvature at the Fermi energy8,9, and so may be seen in magnets with no net magnetization. Here, we report the observation of a large anomalous Nernst effect in the chiral antiferromagnet Mn3Sn (ref. 10). Despite a very small magnetization ∼0.002?μB per Mn, the transverse Seebeck coefficient at zero magnetic field is ∼0.35?μV?K−1 at room temperature and reaches ∼0.6?μV?K−1 at 200?K, which is comparable to the maximum value known for a ferromagnetic metal. Our first-principles calculations reveal that this arises from a significantly enhanced Berry curvature associated with Weyl points near the Fermi energy11. As this effect is geometrically convenient for thermoelectric power generation—it enables a lateral configuration of modules to cover a heat source6—these observations suggest that a new class of thermoelectric materials could be developed that exploit topological magnets to fabricate efficient, densely integrated thermopiles.
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Diverging Berry curvatures near nodal points support intrinsic anomalous Hall effects and anomalous Nernst effects.
“The diverging Berry curvatures near the nodal points support distinct anomalous transport phenomena, including intrinsic anomalous Hall effects (AHEs) (54)(55)(56) and anomalous Nernst effects (57,58).”
From Transport of Topological Semimetals (2019) · cites this paper as [57]
Remarkable anomalous behavior has also been observed in Mn3Sn's Nernst effect.
“Furthermore, remarkable anomalous behavior has also been observed in this material's Nernst effect (57).”
From Transport of Topological Semimetals (2019) · cites this paper as [57]
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Research works printed but not linked: 2
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- Authors
- Ikhlas, M., Tomita, T., Koretsune, T., Suzuki, M.-T., Nishio-Hamane, D., Arita, R., Otani, Y., & Nakatsuji, S.
- Affiliations
- The Institute for Solid State Physics, The University of Tokyo (JP)
- Japan Science and Technology Agency (JP)
- RIKEN (JP)
- Corresponding author
- Nakatsuji, Satoru
- ORCID
- Venue
- Nature Physics
- Published
- 2017-07-24
- Volume
- 13
- Issue
- 11
- Pages
- 1085-1090
- ISSN
- 1745-2473 (ISSN-L)
- 1745-2481
- OpenAlex
- W2736348097
- Semantic Scholar
- 0f3b818b4b08448aef5a31eefcefa50ea7ad69b2
- Cited by
- 746
- References
- 48
- Citations by year
- 2026: 84 · 2025: 132 · 2024: 103 · 2023: 77 · 2022: 87 · 2021: 95 · 2020: 69 · 2019: 58 · 2018: 36 · 2017: 4 · 2012: 1
- FWCI
- 22.41
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Nature Physics (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- arXiv (Cornell University)
- Funders
- University of Tokyo
- Japan Society for the Promotion of Science (26103002, 15H05883, R2604, 15K17713, 15K17785, CREST, 15H05882, 16H02209)
- Japan Science and Technology Agency (CREST, R2604, 15H05883, 16H02209, 15H05882, JPMJCR15Q5, 26103002)
- Core Research for Evolutional Science and Technology (16H02209, 15H05882, JPMJCR15Q5, 15H05883)
- Precursory Research for Embryonic Science and Technology
- Topics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Topological Materials and Phenomena
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Magnetic properties of thin films
- Physical Sciences › Materials Science › Materials Chemistry › Advanced Thermoelectric Materials and Devices
- Keywords
- anomalous Nernst effect, chiral antiferromagnet, Mn3Sn, Berry curvature, Weyl points, topological magnets, thermoelectric power generation, thermopile, room-temperature thermoelectrics, heat current
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