Journal
SCIENCE
Volume 365, Issue 6451, Pages 377-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aat0348
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Funding
- Gordon and Betty Moore Foundation EPiQS Initiative [GBMF3848, GBMF4303]
- NSF [DMR-1818533, PHY-1748958]
- ARO grant [W911-NF-14-1-0379]
- KITP
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Transport coefficients of correlated electron systems are often useful for mapping hidden phases with distinct symmetries. Here we report a transport signature of spontaneous symmetry breaking in the magnetic Weyl semimetal cerium-aluminum-germanium (CeAlGe) system in the form of singular angular magnetoresistance (SAMR). This angular response exceeding 1000% per radian is confined along the high-symmetry axes with a full width at half maximum reaching less than 10 and is tunable via isoelectronic partial substitution of silicon for germanium. The SAMR phenomena is explained theoretically as a consequence of controllable high-resistance domain walls, arising from the breaking of magnetic point group symmetry strongly coupled to a nearly nodal electronic structure. This study indicates ingredients for engineering magnetic materials with high angular sensitivity by lattice and site symmetries.
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