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TT: Fachverband Tiefe Temperaturen
TT 13: Kagome Systems
TT 13.6: Vortrag
Montag, 18. März 2024, 16:15–16:30, H 3010
Charge carrier dynamics of kagome metals GdMn6Sn6 and TbMn6Sn6 probed by transient reflectivity — •Marcos Vinicius Goncalves Faria1,2, Alexej Pashkin1, Stephan Winnerl1, Hechang Lei3, Qi Wang3, Maxim Wenzel4, Manfred Helm1,2, and Ece Uykur1 — 1Helmholtz-Zentrum Dresden-Rossendorf — 2Technische Universität Dresden — 3Renmin University of China — 4Universität Stuttgart
In the present study, we use optical pump-probe spectroscopy in reflection geometry to unravel the dynamics of charge carriers in the magnetic kagome metals GdMn6Sn6 and TbMn6Sn6. The measured pump-probe traces reveal two exponential decay processes and a slow thermal relaxation, similarly to what has been observed in other kagome metals. The exponential decays occur on quite different time scales, and we ascribe them to the dynamics of different types of charge carriers present in the compounds. Additionally, a damped oscillation feature appears during the first 15-20 picoseconds. It can be explained in the context of acoustic strain waves, generated due to a thermal expansion at the sample’s surface that is induced by the pump pulse. We also present temperature and pump fluence dependence for both compounds that helps to understand better the relaxation mechanisms.
Keywords: Magnetic kagome metals; Optical pump-probe spectroscopy