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The properties of kagome metals are governed by the interdependence of bandtopology and electronic correlations resulting in remarkably rich phasediagrams. Here, we study the temperature evolution of the bulk electronicstructure of the antiferromagnetic kagome metal FeGe using infraredspectroscopy. We uncover drastic changes in the low-energy interband absorptionat the 100 K structural phase transition that has been linked to acharge-density-wave (CDW) instability. We explain this effect by the minusculeFe displacement in the kagome plane, which results in parallel bands in thevicinity of the Fermi level. In contrast to conventional CDW materials,however, the spectral weight shifts to low energies, ruling out the opening ofa CDW gap in FeGe.

Intriguing low-temperature phase in the antiferromagnetic kagome metal FeGe