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    Enhanced Anomalous Nernst Effect in the Ferromagnetic Kondo Lattice CeCo2As2

    Shuyue Guan1,*, Weian Guo2,*, Pengyu Zheng2, Xinxuan Lin1, Yuqing Huang1, Jiawei Li1, Xiao-Bin Qiang3, Longfei Li1, Weiwei Xie4 et al.

    Hai-Zhou Lu3, Zhiping Yin2,5,†, and Shuang Jia1,6,7,‡

    • 1International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China
    • 2School of Physics and Astronomy and Center for Advanced Quantum Studies, Beijing Normal University, Beijing 100875, China
    • 3State Key Laboratory of Quantum Functional Materials, Department of Physics, and Guangdong Basic Research Center of Excellence for Quantum Science, Southern University of Science and Technology, Shenzhen 518055, China
    • 4Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
    • 5Key Laboratory of Multiscale Spin Physics (Ministry of Education), Beijing Normal University, Beijing 100875, China
    • 6Interdisciplinary Institute of Light-Element Quantum Materials and Research Center for Light-Element Advanced Materials, Peking University, Beijing 100871, China
    • 7Hefei National Laboratory, Hefei 230088, China

    • *These authors contributed equally to this work.
    • †Contact author: yinzhiping@bnu.edu.cn
    • ‡Contact author: gwljiashuang@pku.edu.cn

    Phys. Rev. Lett. 136, 036505 – Published 23 January, 2026

    DOI: https://doi.org/10.1103/52tp-styb

    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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