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Singular angular magnetoresistance in a magnetic nodal semimetal
T Suzuki1, L Savary1,2,3, J-P Liu2,4
1Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Science (New York, N.Y.)
|June 22, 2019
Summary
We discovered a singular angular magnetoresistance (SAMR) in cerium-aluminum-germanium (CeAlGe), a magnetic Weyl semimetal. This phenomenon signals spontaneous symmetry breaking and can be tuned by material composition.
Area of Science:
- Condensed matter physics
- Materials science
- Solid-state physics
Background:
- Transport coefficients reveal hidden phases in correlated electron systems.
- Magnetic Weyl semimetals exhibit unique electronic properties.
Purpose of the Study:
- To identify a transport signature of spontaneous symmetry breaking in the CeAlGe system.
- To investigate the tunability of this signature via isoelectronic substitution.
Main Methods:
- Experimental measurement of transport coefficients.
- Theoretical explanation of the observed phenomena.
- Isoelectronic partial substitution of silicon for germanium.
Main Results:
- Observation of singular angular magnetoresistance (SAMR) exceeding 1000% per radian.
- SAMR confined to high-symmetry axes with a narrow width (<1°).
- Tunable SAMR through silicon substitution for germanium.
Conclusions:
- SAMR is a signature of spontaneous magnetic point group symmetry breaking in CeAlGe.
- Controllable high-resistance domain walls are responsible for SAMR.
- Lattice and site symmetries can be engineered for high angular sensitivity in magnetic materials.
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