Enhanced Anomalous Nernst Effect in the Ferromagnetic Kondo Lattice CeCo2As2

Abstract

The anomalous Nernst effect (ANE), generating a voltage perpendicular to a temperature gradient due to magnetization, is closely linked to the Berry curvature (BC) near the Fermi energy in topological magnets. We report an enhanced spontaneous ANE in the ferromagnetic Kondo lattice CeCo2As2, which features Kondo-screened cerium-based 4f moments embedded in a ferromagnetic d-electron framework. The observed large anomalous Nernst coefficient, greater than the Seebeck coefficient, is attributed to the strong BC present in the f-orbital-dominated flat bands. The enhanced ANE in CeCo2As2 serves as a signature of the Fermi energy pinning within the topological flat band, highlighting the correlation-driven topology in the Kondo lattice.

References in corpus (16)

• Quantum Monte Carlo Impurity Solver for Cluster DMFT and Electronic Structure Calculations in Adjustable Base
• Berry phase effect in anomalous thermoelectric transport
• Universal Scaling Behavior of Anomalous Hall Effect and Anomalous Nernst Effect in Itinerant Ferromagnets
• Quantum transport theory of anomalous electric, thermoelectric, and thermal Hall effects in ferromagnets
• On the thermoelectricity of correlated electrons in the zero-temperature limit
• Mott Relation for Anomalous Hall and Nernst effects in Ga1-xMnxAs Ferromagnetic Semiconductors
• Large anomalous Nernst effect in a van der Waals ferromagnet Fe${}_3$GeTe${}_2$
• Flat bands, strange metals, and the Kondo effect
• Topological charge-entropy scaling in kagome Chern magnet TbMn${}_6$Sn${}_6$
• Topological Semimetal driven by Strong Correlations and Crystalline Symmetry
• Hall effect in heavy-fermion metals
• Tunable Cobalt Vacancies and Related Properties in LaCoxAs2
• Topological and disorder corrections to the transverse Wiedemann-Franz law and Mott relation in kagome magnets
• Tuning the anomalous Nernst and Hall effects with shifting the chemical potential in Fe-doped and Ni-doped Co${}_3$Sn${}_2$S${}_2$
• Onsager reciprocal relation between anomalous transverse coefficients of an anisotropic antiferromagnet
• What is measured when measuring a thermoelectric coefficient?