SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 23: Kagome Systems

TT 23.7: Vortrag

Dienstag, 28. März 2023, 11:00–11:15, HSZ 304

Temperature-dependent pump-probe spectroscopy of the magetic Kagome metal Fe₃Sn₂ — •M. G. Faria¹, Q. Wang², H. C. Lei², A. Pashkin¹, S. Winnerl¹, M. Helm^1,3, and E. Uykur¹ — ¹Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany — ²Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, 100872 Beijing, China — ³Institute for Applied Physics, Technische Universität Dresden, 01069 Dresden, Germany

In this study, we present optical pump-probe measurements on a magnetic Kagome metal, Fe₃Sn₂, under different temperatures down to 10 K. The obtained spectra can be fitted with a double exponential decay, indicating that the system has two distinct relaxation processes. Additionally, some unexpected and pronounced oscillations are dominating the spectra, giving evidence of a strong electron-phonon coupling in Fe₃Sn₂, at least in this ultra-fast regime. The frequency of this coupled phonon is determined to be around 2.5 THz. Finally, we will discuss the temperature and pump fluence dependence of the observed phonon coupling and the distinct relaxation dynamics in this material.