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Inversion-Asymmetric Itinerant Antiferromagnets by the Space Group Symmetry.
1University of Otago, Department of Physics and the MacDiarmid Institute for Advanced Materials and Nanotechnology, P.O. Box 56, Dunedin 9054, New Zealand.
Physical Review Letters
|September 26, 2025
Summary
Inversion-asymmetric antiferromagnets (IA AFMs) with odd-parity spin splittings emerge in specific nonsymmorphic systems. Conditions for their appearance and stability are identified, guiding material discovery.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid State Physics
Background:
- Antiferromagnetic states can exhibit odd-parity spin splittings when inversion symmetry is broken.
- These phenomena are analogous to those observed in altermagnets.
Purpose of the Study:
- Investigate the emergence of inversion-asymmetric antiferromagnetic (IA AFM) states.
- Explore the itinerant mechanism in nonsymmorphic systems with multiple magnetic ions per unit cell.
Main Methods:
- Symmetry analysis to identify irreducible representations for ordering vectors.
- Landau free energy expansion derived from a microscopic model.
- Investigate band nesting conditions.
Main Results:
- Identified symmetries permitting continuous transitions to IA AFM states.
- Established conditions favoring IA AFMs: non-site inversion symmetry and different band nesting.
- Found a negative correlation between odd-parity spin splitting and IA AFM stability.
Conclusions:
- Provided theoretical insight into the formation and properties of IA AFMs.
- Established criteria for identifying candidate materials with IA AFM states.
- The findings can guide experimental searches for novel magnetic materials.
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