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    Giant Domain Wall Anomalous Hall Effect in a Layered Antiferromagnet EuAl2Si2

    Wei Xia1,8,*, Bo Bai1,*, Xuejiao Chen2,*, Yichen Yang3,*, Yang Zhang1, Jian Yuan1, Qiang Li4, Kunya Yang5, Xiangqi Liu1 et al.

    Yang Shi4, Haiyang Ma1, Huali Yang2, Mingquan He5, Lei Li6, Chuanying Xi7, Li Pi7, Xiaodong Lv9, Xia Wang10, Xuerong Liu1, Shiyan Li4, Xiaodong Zhou11, Jianpeng Liu1,8, Yulin Chen1,8,12, Jian Shen4,11, Dawei Shen3,13,†, Zhicheng Zhong2,‡, Wenbo Wang1,8,§, and Yanfeng Guo1,8,∥

    • *These authors contributed equally to this work.
    • †Contact author: dwshen@ustc.edu.cn
    • ‡Contact author: zhong@nimte.ac.cn
    • §Contact author: wangwb1@shanghaitech.edu.cn
    • ∥Contact author: guoyf@shanghaitech.edu.cn

    Phys. Rev. Lett. 133, 216602 – Published 21 November, 2024

    DOI: https://doi.org/10.1103/PhysRevLett.133.216602

    Abstract

    Generally, the dissipationless Hall effect in solids requires time-reversal symmetry breaking (TRSB), where TRSB induced by external magnetic field results in the ordinary Hall effect, while TRSB caused by spontaneous magnetization gives rise to the anomalous Hall effect (AHE) which scales with the net magnetization. The AHE is therefore not expected in antiferromagnets with vanishing small magnetization. However, large AHE was recently observed in certain antiferromagnets with noncollinear spin structure and nonvanishing Berry curvature. Here, we report another origin of AHE in a layered antiferromagnet EuAl2Si2, namely, the domain wall (DW) skew scattering with Weyl points near the Fermi level, in experiments for the first time. Interestingly, the DWs form a unique periodic stripe structure with controllable periodicity by external magnetic field, which decreases nearly monotonically from 975 nm at 0 T to 232 nm at 4 T. Electrons incident on DW with topological bound states experience strong asymmetric scattering, leading to a giant AHE, with the DW Hall conductivity (DWHC) at 2 K and 1.2 T reaching a record value of ∼1.51×104  Scm−1 among bulk systems and being 2 orders of magnitude larger than the intrinsic anomalous Hall conductivity. The observation not only sets a new paradigm for exploration of large anomalous Hall effect, but also provides potential applications in spintronic devices.

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