Intriguing Low-Temperature Phase in the Antiferromagnetic Kagome Metal FeGe

Abstract

The properties of kagome metals are governed by the interdependence of band topology and electronic correlations resulting in remarkably rich phase diagrams. Here, we study the temperature evolution of the bulk electronic structure of the antiferromagnetic kagome metal FeGe using infrared spectroscopy. We uncover drastic changes in the low-energy interband absorption at the 100 K structural phase transition that has been linked to a charge-density-wave (CDW) instability. We explain this effect by the minuscule Fe displacement in the kagome plane, which results in parallel bands in the vicinity of the Fermi level. In contrast to conventional CDW materials, however, the spectral weight shifts to low energies, ruling out the opening of a CDW gap in FeGe.

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• Vacancy-induced suppression of CDW order and its impact on magnetic order in kagome antiferromagnet FeGe
• Disordered charge density waves in the kagome metal FeGe
• Tunability of charge density wave in a magnetic kagome metal
• MPd5 kagome superconductors studied by density functional calculations
• Interplay of Charge Density Wave and Magnetism on the Kagomé Lattice
• Interlayer charge transfer induced by electronic instabilities in the natural van der Waals hetrostructure 4H${}_b$-TaS${}_2$
• Superconductivity and Electron Correlations in Kagome Metal LuOs3B2
• Beyond kagome: $p$-bands in kagome metals
• High-pressure modulation of breathing kagome lattice: Cascade of Lifshitz transitions and evolution of the electronic structure