Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 6: Complex Magnetic Oxides
MA 6.4: Vortrag
Montag, 5. September 2022, 11:45–12:00, H37
Spin-Orbit Excitations in a Strongly Correlated 4d-Metal Studied by Resonant Inelastic X-ray Scattering — •Valentin Zimmermann1, Deniz Wong2, Christian Schulz2, Maciej Bartkowiak2, Klaus Habicht2, Arvind Yogi3, Masahiko Isobe1, Lichen Wang1, Matteo Minola1, Giniyat Khalliulin1, Bernhard Keimer1, and Matthias Hepting1 — 1Max-Planck-Institute for Solid State Research, Stuttgart, Germany — 2Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany — 3UGC-DAE-Consortium for Scientific Research, Indore, India
Spin-orbit coupling (SOC) is an important player determining the electronic and magnetic properties of 4d and 5d transition metal oxides. The 5d compound Sr2IrO4 is an antiferromagnetic Mott insulator, where SOC leads to a splitting of the t2g manifold into bands with effective total angular momentum Jeff = 3/2 and 1/2. This electronic structure gives rise to low-energy excitations with excitonic character, which were recently studied by resonant inelastic X-ray scattering (RIXS) and assigned to the transition of holes across the spin-orbit split states. Here, we use RIXS at the oxygen K-edge to investigate the isovalent 4d compound Sr2RhO4, which is a paramagnetic, strongly correlated metal. We observe similar spin-orbit excitons as in Sr2IrO4, however, on a smaller energy scale and with a distinct dispersion, which we attribute to a reduced SOC strength and the metallic ground state, respectively. In addition, we explore whether the solid-solution Sr2Rh1−xIrxO4 is a viable platform to tune the effective strength of SOC.