Incommensurate magnetic order drives singular angular magnetoresistance in a Weyl semimetal

2025/09/22 by Yao, X., Chen, P., Verma, R. +15
#FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el)

paper · doi:10.48550/arxiv.2509.18398

Abstract

We demonstrate that a multi-k incommensurate magnetic state in the Weyl semimetal CeAlGe gives rise to singular angular magnetoresistance (SAMR), an electrical-transport signature that detects the magnetic-field direction with exceptional precision. In contrast, the sister compound CeAlSi shows neither multi-k order nor SAMR. Both phenomena emerge upon ∼57% Ge substitution in CeAlSi_1-xGe_x and coincide with electronic-structure changes that soften the single-ion in-plane anisotropy and enhance Weyl-mediated magnetic interactions. These results reveal a direct connection between band topology, electronic transport, and collective magnetism in Weyl semimetals.

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