Ru M3-edge RIXS on α-RuCl3 reveals a single unsplit spin-orbit exciton at 231 meV, yielding λ=154±2 meV and an upper bound |Δ|<65 meV on trigonal distortion, consistent with jeff=1/2 physics.
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Resonant inelastic x-ray scattering study of $\alpha$-RuCl$_3$: a progress report
Ru M3-edge RIXS on α-RuCl3 reveals a single unsplit spin-orbit exciton at 231 meV, yielding λ=154±2 meV and an upper bound |Δ|<65 meV on trigonal distortion, consistent with jeff=1/2 physics.