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

Physical Review Letters 2026 Open access

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Authors: Xiaohan Yao, P. Chen, Rahul K. Verma, X. Zhao, Huanan Yang, Lisa DeBeer‐Schmitt, A. A. Aczel, Chueh‐Hung Wu, D. Alba Venero, Takashi Ohhara, Ko Munakata, M. Takahashi
+6 more Y. Noda, A. Bansil, B. Singh, Predrag Nikolić, Fazel Tafti, Jonathan Gaudet
DOI: 10.1103/fdds-f72t
Cited by: 1
References: 39

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 CeAlSi_{1-x}Ge_{x} 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.

Fields of Study & Subjects

Rare-earth and actinide compounds Magnetic and transport properties of perovskites and related materials Heusler alloys: electronic and magnetic properties

Publication details

Journal / source
Physical Review Letters
Publisher
American Physical Society (APS)
Volume
136
Issue
8
Pages
086702–086702
Publication date
22 January 2026
Language
EN