Observation of the anomalous Nernst effect in altermagnetic candidate Mn5Si3

Antonín Badura (), Warlley H. Campos, Venkata K. Bharadwaj, Ismaïla Kounta, Lisa Michez, Matthieu Petit, Javier Rial, Miina Leiviskä, Vincent Baltz, Filip Krizek, Dominik Kriegner, Jakub Železný, Jan Zemen, Sjoerd Telkamp, Sebastian Sailler, Michaela Lammel, Rodrigo Jaeschke-Ubiergo, Anna Birk Hellenes, Rafael González-Hernández, Jairo Sinova, Tomáš Jungwirth, Sebastian T. B. Goennenwein, Libor Šmejkal () and Helena Reichlova ()
Additional contact information
Antonín Badura: Czech Academy of Sciences
Warlley H. Campos: Max Planck Institute for the Physics of Complex Systems
Venkata K. Bharadwaj: Johannes Gutenberg University Mainz
Ismaïla Kounta: Aix Marseille University, CNRS, CINAM, AMUTECH
Lisa Michez: Aix Marseille University, CNRS, CINAM, AMUTECH
Matthieu Petit: Aix Marseille University, CNRS, CINAM, AMUTECH
Javier Rial: IRIG-SPINTEC
Miina Leiviskä: Czech Academy of Sciences
Vincent Baltz: IRIG-SPINTEC
Filip Krizek: Czech Academy of Sciences
Dominik Kriegner: Czech Academy of Sciences
Jakub Železný: Czech Academy of Sciences
Jan Zemen: Czech Technical University in Prague
Sjoerd Telkamp: Solid State Physics Laboratory, ETH
Sebastian Sailler: University of Konstanz
Michaela Lammel: University of Konstanz
Rodrigo Jaeschke-Ubiergo: Johannes Gutenberg University Mainz
Anna Birk Hellenes: Johannes Gutenberg University Mainz
Rafael González-Hernández: Johannes Gutenberg University Mainz
Jairo Sinova: Johannes Gutenberg University Mainz
Tomáš Jungwirth: Czech Academy of Sciences
Sebastian T. B. Goennenwein: University of Konstanz
Libor Šmejkal: Czech Academy of Sciences
Helena Reichlova: Czech Academy of Sciences

Nature Communications, 2025, vol. 16, issue 1, 1-11

Abstract: Abstract The anomalous Nernst effect generates a voltage transverse to an applied thermal gradient in some magnetically ordered systems. While the effect was considered excluded in compensated magnetic materials with collinear ordering, in the recently identified symmetry-class of altermagnets, the anomalous Nernst effect is possible despite the compensated collinear spin arrangement. In this work, we show that epitaxial Mn5Si3 thin films grown on Si manifest an anomalous Nernst effect with a finite spontaneous signal at zero magnetic field despite the vanishing spontaneous magnetization. We attribute this to the previously theoretically predicted and experimentally corroborated altermagnetism of epitaxial Mn5Si3 thin films grown on Si. The observed spontaneous anomalous Nernst coefficient reaches the value of 0.26 μV/K with the corresponding spontaneous Nernst conductivity of 0.22 A/(K ⋅ m). To complement our measurements, we perform density-functional theory calculations of the momentum-resolved anomalous Nernst conductivity, highlighting the contributions of altermagnetic pseudonodal surfaces and ladder transitions to the Berry curvature. Our results illustrate the value of unconventional d-wave wave altermagnets composed of abundant and non-toxic light elements for thermo-electrics and spin-caloritronics.

Date: 2025
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DOI: 10.1038/s41467-025-62331-7

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