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Intriguing Low-Temperature Phase in the Antiferromagnetic Kagome Metal FeGe.

M Wenzel¹, E Uykur², A A Tsirlin³

¹1. Physikalisches Institut, <a href="https://ror.org/04vnq7t77">Universität Stuttgart</a>, 70569 Stuttgart, Germany.

Physical Review Letters

|July 12, 2024

Summary

Researchers studied the kagome metal FeGe using infrared spectroscopy. They observed changes linked to a charge-density-wave (CDW) instability, but found no CDW gap opening, challenging conventional material behavior.

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Area of Science:

Condensed matter physics
Materials science
Solid-state spectroscopy

Background:

Kagome metals exhibit complex properties due to the interplay of band topology and electronic correlations.
These materials often display rich phase diagrams with unique electronic behaviors.

Purpose of the Study:

To investigate the temperature-dependent electronic structure of the antiferromagnetic kagome metal FeGe.
To understand the impact of a structural phase transition at 100 K on the electronic properties.

Main Methods:

Utilized infrared spectroscopy to probe the bulk electronic structure.
Analyzed temperature evolution of interband absorption spectra.

Main Results:

Observed significant changes in low-energy interband absorption at the 100 K structural phase transition.
Linked these spectral changes to a charge-density-wave (CDW) instability.
Identified minuscule Fe displacement causing parallel bands near the Fermi level.

Conclusions:

The observed spectral weight shift to low energies rules out a conventional charge-density-wave (CDW) gap opening in FeGe.
FeGe exhibits unconventional behavior compared to typical CDW materials, highlighting unique electronic correlations in kagome systems.