Soft-x-ray-absorption studies of the electronic-structure changes through theVO2phase transition

Abstract
We present the O 1s and V 2p absorption edges of VO2 at room temperature and at T=120 °C, i.e., below and above the metal-insulator transition temperature Tc≊67 °C. The O 1s spectra show a clear splitting of 1 eV in the unoccupied d? band below Tc. Because the V 2p absorption edges are dominated by the V 2p-3d interaction in the final state, these spectra show minor changes that cannot be easily correlated with the changes in the unoccupied density of states.

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