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Competing itinerant and local spin interactions in kagome metal FeGe
Lebing Chen1, Xiaokun Teng1, Hengxin Tan2
1Department of Physics and Astronomy, Rice University, Houston, TX, 77005, USA.
Nature Communications
|March 1, 2024
Summary
Two-dimensional Kagome metal FeGe exhibits complex magnetic phases. Neutron scattering reveals gapless spin excitations linked to its double cone antiferromagnetic structure, originating from nested Fermi surfaces and spin density wave order.
Area of Science:
- Condensed Matter Physics
- Quantum Materials
- Magnetism
Background:
- Two-dimensional Kagome metals possess geometrically frustrated lattices and similar energy scales, leading to rich quantum phases.
- FeGe, a Kagome metal, displays sequential magnetic ordering: A-type antiferromagnetic (AFM) order, charge density wave (CDW) phase, and a double cone AFM structure.
Purpose of the Study:
- To investigate the nature of spin excitations in the Kagome metal FeGe.
- To elucidate the relationship between magnetic structures and electronic properties.
- To understand the origin of the incommensurate magnetic structure.
Main Methods:
- Neutron scattering experiments were employed to probe spin excitations.
- Density functional theory (DFT) calculations were used for theoretical analysis.
- Analysis of spin wave behavior and its temperature dependence.
Main Results:
- Observed gapless incommensurate spin excitations above the double cone AFM transition temperature.
- These excitations merge into gapped commensurate spin waves associated with the A-type AFM order.
- Incommensurate spin excitations exhibit critical scattering behavior, consistent with a second-order magnetic phase transition.
Conclusions:
- The incommensurate magnetic structure in FeGe arises from nested Fermi surfaces of itinerant electrons.
- The formation of a spin density wave order is identified as the mechanism behind these excitations.
- Neutron scattering provides crucial insights into the complex interplay of magnetic order and electronic structure in Kagome metals.
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