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

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.

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Journal
Physical Review Letters
Published
2026-01-22
DOI
https://doi.org/10.1103/fdds-f72t
Primary Topic
Rare-earth and actinide compounds
Type
article
Field-Weighted Citation Impact
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article

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

Jonathan Gaudet, Predrag Nikolić, Lisa DeBeer‐Schmitt, Chueh‐Hung Wu et al.
Physical Review Letters
Rare-earth and actinide compounds
article

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

Jonathan Gaudet, Predrag Nikolić, Lisa DeBeer‐Schmitt, Chueh‐Hung Wu, A. Bansil, Takashi Ohhara, Fazel Tafti, Rahul Verma, Huanan Yang, K. Munakata, Anonymous, X. Zhao, Y. Noda, B. Singh, A. A. Aczel, D. Alba Venero, M. Takahashi, P. Chen
article en

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.

Physical Review LettersVol. 136(8)
Boston College (US), Japan Atomic Energy Agency (JP), Tata Institute of Fundamental Research (IN), Rutherford Appleton Laboratory (GB), Oak Ridge National Laboratory (US), National Institute of Standards and Technology (US), Johns Hopkins University (US), University of Tsukuba (JP), George Mason University (US), Tohoku University (JP), University of California System (US), National Synchrotron Radiation Research Center (TW), National Institute of Standards (EG), University of Maryland, College Park (US), The University of Tokyo (JP), Universidad del Noreste (MX)
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