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TT: Fachverband Tiefe Temperaturen

TT 13: Kagome Systems

TT 13.8: Vortrag

Montag, 18. März 2024, 17:00–17:15, H 3010

High-pressure infrared spectroscopy study on magnetic kagome metal Fe₃Sn₂ — •Ece Uykur^1,2, Maxim Wenzel², Francesco Capitani³, Qi Wang⁴, Hechang Lei⁴, Stephan Winnerl¹, and Martin Dressel² — ¹Helmholtz-Zentrum Dresden-Rossendorf, Inst. Ion Beam Phys. & Mat. Res., 01328 Dresden, Germany — ²1. Physikalisches Institut, Universität Stuttgart, 70569, Stuttgart, Germany — ³Synchrotron SOLEIL, 91192, Saint-Aubin, France — ⁴Renmin University of China, 100872, Beijing, China

We present a high-pressure broadband optical study of ferromagnetic kagome metal Fe₃Sn₂ at room temperature up to 18 GPa. Different contributions to the optical spectra have been discussed and compared with the DFT calculations, which use the experimental high-pressure crystal structure. Infrared spectra reveal the signatures of conventional and unconventional charge carriers in the compound. While the low-energy spectral range reflects the response of the mobile charge carriers and is significantly modified with increasing pressure, the high energy range shows the modification of the interband transitions in the compound. We also observe the appearance of a sharp plasma edge at energies below 300 cm⁻¹ that gradually shifts to the higher energy range in accordance with the appearance of a new Fermi surface under pressure.

Keywords: Kagome metals; High pressure; Infrared spectroscopy