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    Strong anomalous Hall conductivity anisotropy in a kagomelike topological semimetal with composition tunability

    Feng Zhou1,2, Hang Li1,*, Guanghui Lu1,2, Jie Du1, Jie Chen1, Tao Zhu1, Xiaodong Zhou1, Linxuan Song1,2, Yong-Chang Lau2,3,† et al.

    Yue Li1, Yong Jiang1, and Wenhong Wang1,‡

    • *Contact author: hangli@tiangong.edu.cn
    • †Contact author: yongchang.lau@iphy.ac.cn
    • ‡Contact author: wenhongwang@tiangong.edu.cn

    Phys. Rev. B 113, 224408 – Published 1 June, 2026

    DOI: https://doi.org/10.1103/54s4-2jgd

    Abstract

    Triangular atomic arrangements exhibit exceptional physical properties and can host diverse magnetic states, serving as an outstanding platform for investigating the interplay between magnetism, symmetry, and electronic transport. In this study, we reveal a large, tunable, and switchable anomalous Hall effect in a kagome-like-lattice ferromagnet Mn5Ge3, utilizing ab-initio calculations and electrical transport measurements. We find that the intrinsic anomalous Hall conductivity (AHC) in Mn5Ge3 shows switchable anisotropy with magnetic moment M oriented along different axes. Our theoretical calculations suggest that this large AHC is closely linked to the topological nodal rings in the band structure near the Fermi level and is strongly influenced by the Ge occupancy at the 2b site. Experimental data indicate that the AHC can reach up to 1053 S/cm when the current is applied along [120], and the magnetic field is along [001] in Mn5Ge3+x single crystal with approximately x=0.33 Ge doping. We show that in kagome-like structures, atomic doping at specific lattice sites enables precise modulation of topological electronic properties while maintaining structural and symmetry integrity. This approach offers a unique pathway for designing novel quantum materials with tunable electronic properties, highlighting its potential for advancing the development of next-generation quantum devices.

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