Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 13: Kagome Systems
TT 13.8: Talk
Monday, March 18, 2024, 17:00–17:15, H 3010
High-pressure infrared spectroscopy study on magnetic kagome metal Fe3Sn2 — •Ece Uykur1,2, 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