SKM 2023 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 46: Frustrated Magnets: Spin Liquids
TT 46.2: Talk
Thursday, March 30, 2023, 09:45–10:00, HSZ 201
XMCD studies of honeycomb lattice compound RuBr3 — •Sahana Roessler1, X. Wang1, S. Agrestini2, Z. Hu1, C. Guillemard3, J. Herrero-Martin3, U. Schwarz1, M. W. Haverkort4, and L. H. Tjeng1 — 1Max-Planck Institute for Chemical Physics of Solids, Dresden Germany — 2Diamond Light Source, Oxfordshire, United Kingdom — 3ALBA Synchrotron Light source, Barcelona, Spain — 4Institute of theoretical physics, Heidelberg University, Germany.
The high-pressure phase of RuBr3 consisting of a honeycomb lattice [1] is structurally essentially isotypic to the Kitaev quantum spin liquid candidate α-RuCl3. As in α-RuCl3, Ru3+ ion in RuBr3 is in 4d5 electronic configuration and expected to be in a spin-orbit coupled Jeff =1/2 doublet ground state. Here, we will present the results of X-ray magnetic circular dichroism (XMCD) measurements on RuBr3 performed at the Ru L2,3 absorption edges. The spin and orbital moments were determined using the sum rule analysis. In addition, the XMCD spectra were simulated using the full atomic-multiplet cluster calculations within the configuration interaction approach. By comparing the experimental spectra with the theoretical simulations, we determined the ratio of spin to orbital moments along with the values of the crystal field splitting and the spin-orbit coupling in RuBr3. Our results indicated the Jeff = 1/2 ground state for RuBr3, which is one of the requisites for the Kitaev quantum spin-liquid behavior. [1] Imai et al., Phys. Rev. B 105, L041112 (2022).