Regensburg 2025 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 40: Frustrated Magnets II
MA 40.8: Vortrag
Donnerstag, 20. März 2025, 17:00–17:15, H20
Pressure-tuning Na3Co2SbO6 in the Kitaev Quantum Spin Liquid state — •Steven Gebel1, Swarnamayee Mishra1, Martin Sundermann2, Marein Rahn3, and Jochen Geck1 — 1Institute of Solid State and Materials Physics, Technische Universität Dresden, Haeckelstr. 3, 01069 Dresden, Germany — 2PETRA III, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany — 3Center for Electronic Correlations and Magnetism, University of Augsburg, Universitätsstraße 1, 86159 Augsburg, Germany
Honeycomb cobaltates with Co2+ (3d7) ions have been proposed as materials that can host Kitaev’s quantum spin liquid state (QSL). Specifically, Na3Co2SbO6 has been predicted to exhibit a Kitaev QSL upon reduction of the trigonal ligand and crystal field splitting, which in turn might be possible via the elastic tuning of the lattice structure. This compound hosts edge-sharing CoO6 octahedra and exhibits antiferromagnetic (AFM) zig-zag ordering below 7 K, reminiscent of other well-known QSL-candidate, α-RuCl3. In this study, a combination of x-ray diffraction (XRD) and spectroscopy (NIXS) in diamond anvil cells (DACs) is used to establish the pressure dependence of the lattice structure and its effect on the electronic 3d-shell. The pressure dependent Co L-edge spectra are compared to multiplet calculations based on the structural data obtained from refinements of the XRD data. Combining elastic tuning of the lattice structure with XRD, Co L-edge spectra and core-level-spectroscopy simulations, is a very promising approach to confirm whether honeycomb cobaltates can be driven into the Kitaev QSL state.
Keywords: Quantum Spin Liquid (QSL); Diamond Anvil Cell; Non-Resonant Inelastic X-Ray diffraction (NIXS); Single crystal x-ray diffraction (XRD); Trigonal crystal electric field