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TT: Fachverband Tiefe Temperaturen

TT 77: Frustrated Magnets: Strong Spin-Orbit Coupling II

TT 77.1: Talk

Thursday, March 21, 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 Grüninger11Institute 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

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