Inelastic neutron scattering of the layered Kitaev ferromagnet Li3Co2SbO6
Abstract
Cobalt-based quantum magnets forming layered honeycomb arrangements have attracted much attention recently, as they are considered as a potential platform for materials with exotic Kitaev spin exchange. Amongst the discussed candidate materials are Na3Co2SbO6 and Na2Co2TeO6, both possessing a low-temperature ground state with some form of antiferromagnetic ordering (zigzag or triple-Q), similar to Na2IrO3 and α-RuCl3. Here we report inelastic neutron scattering experiments on the quantum magnet Li3Co2SbO6, which features ferromagnetic honeycomb planes with opposite magnetizations in neighboring planes. By comparing with linear spin wave theory, we show that the magnetic properties of Li3Co2SbO6 can be well-modelled by an extended Kitaev--Heisenberg model, establishing it as a Kitaev-ferromagnet, or more specifically, as a Kitaev A-type antiferromagnet. Our analysis is complemented by magnetic field measurements and simulations.
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