Berlin 2024 – scientific programme
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MA: Fachverband Magnetismus
MA 52: Altermagnets
MA 52.10: Talk
Friday, March 22, 2024, 12:00–12:15, EB 202
Anomalous Nernst effect of altermagnetic Mn5 Si3 — •Antonin Badura1, Warlley Campos2, Javier Rial3, Ismaïla Kounta4, Lisa Michez4, Jan Zemen5, Filip Křížek1, Kamil Olejník1, Dominik Kriegner1, Sebastian Sailer6, Jairo Sinova2, Vincent Baltz3, Tomas Jungwirth1, Libor Šmejkal2, Sebastian T. B. Goennenwein6, and Helena Reichlova1 — 1Institute of Physics, Czech Academy of Sciences, Prague, Czechia — 2Institut für Physik, Johannes Gutenberg Universität Mainz, Germany — 3Univ. Grenoble Alpes, CNRS, CEA, Grenoble INP, Spintec, Grenoble, France — 4Aix-Marseille University, CNRS, CINaM, Marseille, France — 5Faculty of Electrical Engineering, Czech Technical University in Prague, Czechia — 6Universität Konstanz, Fachbereich Physik, Konstanz, Germany
The spin-split electronic band structure of altermagnetic materials gives rise to various spintronic phenomena, many of which were already confirmed experimentally. However, an experimental investigation of thermoelectric phenomena in altermagnets, such as the anomalous Nernst effect, is still missing. Here, we demonstrate the presence of the anomalous Nernst effect in a particular altermagnetic candidate, thin epitaxial layers of Mn5 Si3. The transverse Nernst voltage is generated by a temperature gradient in the sample (0001) plane. We carefully analyze the dependence of the Nernst signal on the applied magnetic field and identify multiple contributions to the signal, demonstrating the complex transport response of our layers. Furthermore, our experimental study is supported by ab initio calculations of the anomalous Nernst coefficient in Mn5 Si3.
Keywords: Nernst effect; altermagnetism; Mn5Si3