Abstract
The electronic structure of the -type transparent conducting oxide has been studied by x-ray photoemission, x-ray absorption, and x-ray emission spectroscopies. The upper part of the valence band derives mainly from and states while the lower valence-band states are of dominant atomic character, but with pronounced mutual hybridization among , , and states. Site specific electronic excitations have been studied by resonant inelastic x-ray scattering at the and edges. Inelastic loss at the edge is dominated by on-site interband excitations similar to those found in , while at the edge localized excitations arising from ligand field splitting of the levels are observed. Mg doping on the Cr sites in is shown to lead to a pronounced shift in the Fermi level toward the edge of the valence band. The experimental data are compared to electronic structure calculations on carried out using density-functional methods corrected for onsite Coulomb repulsion.
2 More- Received 31 October 2008
DOI:https://doi.org/10.1103/PhysRevB.79.075102
©2009 American Physical Society