Intertwining of magnetism and charge ordering in kagome FeGe

Abstract

Recent experiments report a charge density wave (CDW) in the antiferromagnet FeGe, but the nature of the charge ordering and the associated structural distortion remains elusive. We discuss the structural and electronic properties of FeGe. Our proposed ground state phase accurately captures atomic topographies acquired by scanning tunneling microscopy. We show that the 2$\times$2$\times$1 CDW likely results from the Fermi surface nesting of hexagonal-prism-shaped kagome states. FeGe is found to exhibit distortions in the positions of the Ge atoms instead of the Fe atoms in the kagome layers. Using in-depth first-principles calculations and analytical modeling, we demonstrate that this unconventional distortion is driven by the intertwining of magnetic exchange coupling and CDW interactions in this kagome material. Movement of Ge atoms from their pristine positions also enhances the magnetic moment of the Fe kagome layers. Our study indicates that magnetic kagome lattices provide a material candidate for exploring the effects of strong electronic correlations on the ground state and their implications for transport, magnetic, and optical responses in materials.

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Cited by in corpus (26)

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• Enhanced Spin-polarization via Partial Ge1-dimerization as the Driving Force of the 2$\times$2$\times$2 CDW in FeGe
• Annealing-tunable charge density wave in the kagome antiferromagnet FeGe
• Novel three-dimensional Fermi surface and electron-correlation-induced charge density wave in FeGe
• Magnetic interactions and possible structural distortion in kagome FeGe from first-principles study and symmetry analysis
• Intriguing Low-Temperature Phase in the Antiferromagnetic Kagome Metal FeGe
• Spin-charge-lattice coupling across the charge density wave transition in a Kagome lattice antiferromagnet
• Annealing-induced long-range charge density wave order in magnetic kagome FeGe: fluctuations and disordered structure
• Symmetry breaking and ascending in the magnetic kagome metal FeGe
• Visualizing symmetry-breaking electronic orders in epitaxial Kagome magnet FeSn films
• Kagome metals
• Charge Dynamics of an Unconventional Three-Dimensional Charge Density Wave in Kagome FeGe
• Anisotropic transport properties and topological Hall effect in the annealed kagome antiferromagnet FeGe
• Instability of the charge density wave in Kagome magnet FeGe
• Disordered charge density waves in the kagome metal FeGe
• Perspective: imaging atomic step geometry to determine surface terminations of kagome materials and beyond
• MPd5 kagome superconductors studied by density functional calculations
• Lattice dynamics study of electron-correlation-induced charge density wave in antiferromagnetic kagome metal FeGe
• Interplay of Charge Density Wave and Magnetism on the Kagomé Lattice
• Encoding innumerable charge density waves of FeGe into polymorphs of LiFe6Ge6
• Anisotropic response of defect bound states to magnetic field in epitaxial FeSn films
• Beyond kagome: $p$-bands in kagome metals
• Single crystal growth, structural and physical properties, and absence of a charge density wave in Ti_{0.85}Fe6Ge6
• Nature of magnetic exchange interactions in kagome antiferromagnets FeGe and FeSn
• Thermoelectric evidence of the electronic structure changes from the charge-density-wave transition in FeGe