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<p>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 Mn<sub>5</sub>Si<sub>3</sub> 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 Mn<sub>5</sub>Si<sub>3</sub> 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 &#xa0;⋅&#xa0; 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.</p>

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Observation of the anomalous Nernst effect in altermagnetic candidate Mn5Si3

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月2日

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  • 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,
  • Helena Reichlova

摘要

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.