Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 13: Kagome Systems
TT 13.9: Talk
Monday, March 18, 2024, 17:15–17:30, H 3010
Broadband optical investigations of the antiferromagnetic kagome metal FeGe — •Maxim Wenzel1, Alexander A. Tsirlin2, Sudip Pal1, Renjith Mathew Roy1, Chandra Shekhar3, Claudia Felser3, Ece Uykur4, Artem V. Pronin1, and Martin Dressel1 — 11. Physikalisches Institut, Universität Stuttgart, Germany — 2Felix Bloch Institute for Solid-State Physics, Leipzig University, Germany — 3Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 4Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Germany
Hexagonal FeGe is a two-dimensional kagome metal with the intricate coexistence of magnetism and charge-density-wave (CDW) order. Here, we present a broadband optical spectroscopy study of the antiferromagnetic compound down to 10 K. The contributions of itinerant and localized charge carriers to the optical spectra are comparatively discussed and signatures of the emerging CDW state below approximately 100 K are unveiled. Aided by DFT calculations, we show that the low-energy interband transitions are very sensitive to small changes of the Fermi level and uncover a delicate interplay between phonons, charge order, and localized carriers.
Keywords: Kagome metals; Fourier-transform infrared spectroscopy; Charge-density-wave