Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 77: Frustrated Magnets: Strong Spin-Orbit Coupling II
TT 77.1: Vortrag
Donnerstag, 21. März 2024, 15:00–15:15, H 3025
Spin-orbit coupling in a half-filled t2g shell: the case of 5d3 K2ReCl6 — •Philipp Warzanowski1, Marco Magnaterra1, Gereon Schlicht1, Quentin Faure2,3, Christoph J. Sahle2, Petra Becker4, Ladislav Bohatý4, Marco Moretti Sala5, Giulio Monaco6, Maria Hermanns7, Paul H. M. van Loosdrecht1, and Markus Grüninger1 — 1Institute of Physics II, University of Cologne — 2ERSF, Grenoble, France — 3LLB, Paris-Saclay, France — 4Sect. Crystallography, University of Cologne — 5Politecnico di Milano, Italy — 6Università di Padova, Italy — 7Stockholm University, Sweden
Strong spin-orbit coupling ζ is typically a game changer in 5d transition-metal compounds. The half-filled t2g3 shell, however, stands out due to its quenched orbital moment. This viewpoint has been tackled by Streltsov and Khomskii for large ζ/JH, i.e., in the jj-coupling limit [1]. Here, we present our results of resonant inelastic x-ray scattering (RIXS) and optical spectroscopy of the 5d3 Mott insulator K2ReCl6, studying on-site d-d excitations and overtones thereof, the Mott gap, and charge-transfer excitations [2]. From comparison with single-site multiplet calculations, we determine ζ/JH and the cubic crystal field-splitting 10Dq for this compound and discuss the effect of ζ on the ground state.
[1] S. Streltsov and D. I. Khomskii, PRX 10, 031043 (2020)
[2] P. Warzanowski et al., arXiv:2311.11419
Keywords: Spin-orbit coupling; Mott Insulators; RIXS; Optical Spectroscopy