Regensburg 2022 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 3: Superconductivity: Properties and Electronic Structure
TT 3.4: Vortrag
Montag, 5. September 2022, 10:15–10:30, H23
Theory of spin-excitation anisotropy in the nematic phase of FeSe obtained from RIXS measurements — •Andreas Kreisel1, Peter Hirschfeld2, and Brian M. Andersen3 — 1Institut für Theoretische Physik, Universität Leipzig — 2Department of Physics, University of Florida, Gainesville — 3Niels Bohr Institute, University of Copenhagen
Recent resonant inelastic x-ray scattering (RIXS) experiments have detected a significant high-energy spin-excitation anisotropy in the nematic phase of the enigmatic iron-based superconductor FeSe [1], whose origin remains controversial. We apply an itinerant model previously used to describe the spin-excitation anisotropy as measured by neutron scattering measurements [2], with magnetic fluctuations included within the RPA approximation. The calculated RIXS cross section exhibits overall agreement with the RIXS data [3], including the high energy spin-excitation anisotropy such that the picture of a localized Heisenberg model does not need to be evoked in order to explain the experimental data.
[1] X. Lu et al., Nat. Phys. (2022)
[2] T. Chen et al. Nat. Mater. 18, 709 (2019)
[3] A. Kreisel, P. J. Hirschfeld, B. M. Andersen, Frontiers in Physics 10, 859424 (2022)