Enhanced Anomalous Nernst Effect in the Ferromagnetic Kondo Lattice CeCo2As2
Shuyue Guan, Weian Guo, Pengyu Zheng, Xinxuan Lin, Yuqing Huang, Jiawei Li, Xiao-Bin Qiang, Longfei Li, Weiwei Xie, Hai-Zhou Lu, Zhiping Yin, Shuang Jia
TL;DR
This paper reports an enhanced anomalous Nernst effect in CeCo2As2, a ferromagnetic Kondo lattice, attributed to strong Berry curvature in flat bands, revealing correlation-driven topological features.
Contribution
It demonstrates a significant enhancement of the anomalous Nernst effect in CeCo2As2 due to Berry curvature effects in a Kondo lattice, highlighting correlation-driven topological phenomena.
Findings
Large anomalous Nernst coefficient exceeds the Seebeck coefficient.
Enhanced ANE linked to Berry curvature in flat bands.
Fermi energy pinned within a topological flat band.
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.
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