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TT: Fachverband Tiefe Temperaturen

TT 37: Ruthenates

TT 37.9: Talk

Wednesday, March 29, 2023, 17:15–17:30, HSZ 201

Propagating charge carrier plasmon in Sr₂RuO₄ — Martin Knupfer¹, Fabian Jerzembeck², Naoki Kikugawa³, Friedrich Roth⁴, and •Jörg Fink¹ — ¹Leibniz Institute of Solid State an Materials Research, Dresden — ²MPI for Chemical Physics of Solids, Dresden — ³National Institute for Material Science, Tsukuba, Japan — ⁴Institute of Exp. Physics, TU Bergakademie Freiberg

We report on studies of charge carrier plasmon excitations in Sr₂RuO₄ by transmission Electron Energy-Loss Spectroscopy. In particular, we present results on the plasmon dispersion and its width as a function of momentum transfer. The dispersion can be qualitatively explained in the framework of RPA calculations, using an unrenormalized tight-binding band structure. The constant long-wavelength width of the plasmon indicates, that it is caused by a decay into inter-band transition and not by quantum critical fluctuations. The results from these studies on a prototypical highly correlated metal system show that the long-wavelength plasmon excitations near 1 eV are caused by resilient quasiparticles and are not influenced by correlation effects.