SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 3: Magnetic Materials for Efficient Energy Conversion
MA 3.6: Vortrag
Montag, 27. März 2023, 10:45–11:00, HSZ 401
Large Room Temperature Anomalous Transverse Thermoelectric Effect in Kagome Antiferromagnet YMn6Sn6 — •Subhajit Roychowdhury1, Andrew M. Ochs2, Satya N. Guin1, Kartik Samanta1, Jonathan Noky1, Chandra Shekhar1, Maia G. Vergniory1, Joshua E. Goldberger2, and Claudia Felser1 — 1Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany — 2The Ohio State University, Columbus, 43210 Ohio, United States
Kagome magnets possess several novel non-trivial topological features owing to the strong correlation between topology and magnetism, that extends to their applications in the field of thermoelectricity. Conventional thermoelectric (TE) devices use the Seebeck effect to convert heat into electrical energy. In contrast, transverse thermoelectric devices based on the Nernst effect are attracting recent attention due to their unique transverse geometry, which uses a single material to eliminate the need for a multitude of electrical connections compared to conventional TE devices. In this study, we obtain a large anomalous transverse thermoelectric effect of ~ 2 microV K-1 at room temperature in a kagome antiferromagnet YMn6Sn6 single crystal. The obtained value is larger than that of state-of-the-art canted antiferromagnetic (AFM) materials and comparable with ferromagnetic systems. The large anomalous Nernst effect (ANE) can be attributed to the net Berry curvature near the Fermi level.