Determination of the Orbital Moment and Crystal-Field Splitting inLaTiO3

Utilizing a sum rule in a spin-resolved photoelectron spectroscopic experiment with circularly polarized light, we show that the orbital moment in ${\mathrm{L}\mathrm{a}\mathrm{T}\mathrm{i}\mathrm{O}}_{3}$ is strongly reduced from its ionic value, both below and above the N\'eel temperature. Using Ti ${L}_{2,3}$ x-ray absorption spectroscopy as a local probe, we found that the crystal-field splitting in the ${t}_{2g}$ subshell is about 0.12--0.30 eV. This large splitting does not facilitate the formation of an orbital liquid.