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    Incommensurate Magnetism Drives Singular Angular Magnetoresistance in the Magnetic Weyl Semimetal CeAlGe

    X. Yao1, P. Chen2, R. Verma3, X. Zhao1, H.-Y. Yang1,4, L. DeBeer-Schmitt5, A. A. Aczel5, C.-M. Wu6, D. Alba Venero7 et al.

    T. Ohhara8, K. Munakata9, M. Takahashi10, Y. Noda11,12, A. Bansil13,14, B. Singh3, P. Nikolić15,16, F. Tafti1, and J. Gaudet2,17

    Phys. Rev. Lett. 136, 086702 – Published 24 February, 2026

    DOI: https://doi.org/10.1103/fdds-f72t

    Abstract

    We demonstrate that a multi-k incommensurate magnetic state in the Weyl semimetal CeAlGe gives rise to a singular angular magnetoresistance (SAMR), which is an electrical transport signature capable of detecting magnetic field direction with exceptional precision. In contrast, its sister compound CeAlSi is devoid of both multi-k order and SAMR. We reveal that both phenomena appear upon 57% Ge substitution in CeAlSi1−xGex and coincide with electronic structure changes that soften the single-ion in-plane anisotropy and enhance Weyl-mediated magnetic interactions. These results unveil a remarkable connection between band topology, electronic transport, and collective magnetism in Weyl semimetals.

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