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.
@article{arxiv.2604.17987,
title = {Enhanced Anomalous Nernst Effect in the Ferromagnetic Kondo Lattice CeCo2As2},
author = {Shuyue Guan and Weian Guo and Pengyu Zheng and Xinxuan Lin and Yuqing Huang and Jiawei Li and Xiao-Bin Qiang and Longfei Li and Weiwei Xie and Hai-Zhou Lu and Zhiping Yin and Shuang Jia},
journal= {arXiv preprint arXiv:2604.17987},
year = {2026}
}