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Large anomalous Nernst effect and nodal plane in an iron-based kagome ferromagnet.
- Source :
-
Science advances [Sci Adv] 2022 Jan 14; Vol. 8 (2), pp. eabk1480. Date of Electronic Publication: 2022 Jan 14. - Publication Year :
- 2022
-
Abstract
- Anomalous Nernst effect (ANE), converting a heat flow to transverse electric voltage, originates from the Berry phase of electronic wave function near the Fermi energy E <subscript>F</subscript> . Thus, the ANE provides a sensitive probe to detect a topological state that produces large Berry curvature. In addition, a magnet that exhibits a large ANE using low-cost and safe elements will be useful to develop a novel energy harvesting technology. Here, we report our observation of a high ANE exceeding 3 microvolts per kelvin above room temperature in the kagome ferromagnet Fe <subscript>3</subscript> Sn with the Curie temperature of 760 kelvin. Our theoretical analysis clarifies that a “nodal plane” produces a flat hexagonal frame with strongly enhanced Berry curvature, resulting in the large ANE. Our discovery of the large ANE in Fe <subscript>3</subscript> Sn opens the path for the previously unexplored functionality of flat degenerate electronic states and for developing flexible film thermopile and heat current sensors.
Details
- Language :
- English
- ISSN :
- 2375-2548
- Volume :
- 8
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Science advances
- Publication Type :
- Academic Journal
- Accession number :
- 35030028
- Full Text :
- https://doi.org/10.1126/sciadv.abk1480