Observation of the anomalous Nernst effect in altermagnetic candidate Mn5Si3

Abstract

The anomalous Nernst effect generates transverse voltage to the applied thermal gradient in magnetically ordered systems. The effect was previously considered excluded in compensated magnetic materials with collinear ordering. However, in the recently identified class of compensated magnetic materials, dubbed altermagnets, time-reversal symmetry breaking in the electronic band structure makes the presence of the anomalous Nernst effect possible despite the collinear spin arrangement. In this work, we investigate epitaxial Mn5Si3 thin films known to be an altermagnetic candidate. We show that the material manifests a sizable anomalous Nernst coefficient despite the small net magnetization of the films. The measured magnitudes of the anomalous Nernst coefficient reach a scale of microVolts per Kelvin. We support our magneto-thermoelectric measurements by density-functional theory calculations of the material's spin-split electronic structure, which allows for the finite Berry curvature in the reciprocal space. Furthermore, we present our calculations of the intrinsic Berry-curvature Nernst conductivity, which agree with our experimental observations.

References in corpus (10)

• Berry phase effect in anomalous thermoelectric transport
• Non-collinear Antiferromagnets and the Anomalous Hall Effect
• Large anomalous Nernst effect in a van der Waals ferromagnet Fe${}_3$GeTe${}_2$
• Anisotropy of the anomalous Hall effect in the altermagnet candidate Mn${}_5$Si${}_3$ films
• Magneto-Seebeck microscopy of domain switching in collinear antiferromagnet CuMnAs
• Complex magnetic structure and spin waves of the noncollinear antiferromagnet Mn5Si3
• Altermagnetic variants in thin films of Mn5Si3
• Anomalous Nernst effect in the noncollinear antiferromagnet Mn${}_5$Si${}_3$
• Optical signatures of spin symmetries in unconventional magnets
• Colossal anomalous Nernst effect in a correlated noncentrosymmetric kagome ferromagnet

Cited by in corpus (9)

• Three-dimensional mapping of the altermagnetic spin splitting in CrSb
• (Anti-)Altermagnetism from Orbital Ordering in the Ruddlesden-Popper Chromates Sr${}_{n+1}$Cr${}_n$O${}_{3n+1}$
• Model Hamiltonian for Altermagnetic Topological Insulators
• Altermagnetism, ARPES, symmetry, non-relativistic band splitting
• Spin-biased quantum spin Hall effect in altermagnetic Lieb lattice
• Non-Hermitian higher-order topological insulators enabled by altermagnet engineering
• Intrinsic Berry Curvature Driven Anomalous Hall and Nernst Effect in Co${}_2$MnSn
• Magnetic aftereffect and Barkhausen effect in thin films of the altermagnetic candidate Mn5Si3
• Altermagnetism from the viewpoint of chemistry