SKM 2023 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
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.