Nature of the midgap state, which develops in the charge transfer gap of oxide superconductors with hole doping, is studied by use of the p-d mixing model with and without the interatomic short distance Coulomb interaction (V-term). Composite operators representing electronic excitations associated with Cu-O bonds are introduced and a generalized mean field theory is developed. The doping dependence of the electronic state can be well described by this approach.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering