Magnetism-Driven Magnetoresistance in a Weyl Semimetal

June 12, 2026
(a-c) GP-SANS resolves ~10 nm modulations; (d) VERITAS confirms magnetic orderfor x > xc.

Scientific Achievement

Discovered that multi-k incommensurate magnetism in the Weyl semimetal CeAlGe drives singular angular magnetoresistance (SAMR). Chemical tuning of CeAlSi1-xGex revealed that both the incommensurate order and SAMR vanish below a critical concentration of xc= 0.57.

Significance and Impact

This work establishes a direct link between electronic band topology and collective magnetism, providing a tunable platform for future high-precision magnetic field sensing technologies.

Research Details

Neutron scattering at GP-SANS and VERITAS (HFIR) resolved the 10 nm spin modulations and magnetic order, supported by PPMS transport and DFT modeling.

“Incommensurate Magnetism Drives Singular Angular Magnetoresistance in the Magnetic Weyl Semimetal CeAlGe,“ Physical Review Letters 136, 086702 (2026).
https://doi.org/10.1103/fdds-f72t