Correlations in the electronic structure of half-metallic ferromagneticCrO2films: An x-ray absorption and resonant photoemission spectroscopy study

Abstract

The electronic structure of high-quality ${\mathrm{CrO}}_{2}(100)$ films was investigated by means of x-ray absorption and resonant photoemission spectroscopy at the $2p\text{\ensuremath{-}}3d$ excitation threshold. The obtained binding energy of the occupied Cr $3d$ states is in agreement with the results predicted within the local spin-density approximation using the dynamical mean-field theory [L. Craco et al., Phys. Rev. Lett. 90, 237203 (2003)]. The reported data support a model of ${\mathrm{CrO}}_{2}$ as a half-metallic ferromagnet with strong electron-correlation effects.