Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-05-29
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 4 figures, 1 table; Version 2 - major content revision
Scientific paper
We report on the optical properties of magnetic cobalt-doped anatase phase titanium dioxide Ti_{1-x}Co_{x}O_{2-d} films for low doping concentrations, 0 <= x <= 0.02, in the spectral range 0.2 to 5 eV. For well oxygenated films (d << 1) the optical conductivity is characterized by an absence of optical absorption below an onset of interband transitions at 3.6 eV and a blue shift of the optical band edge with increasing Co concentration. The absence of below band gap absorption is inconsistent with theoretical models which contain midgap magnetic impurity bands and suggests that strong on-site Coulomb interactions shift the O-band to Co-level optical transitions to energies above the gap.
Choudhary R. J.
Drew Dennis H.
Ogale S. B.
Shinde S. R.
Simpson Robert J.
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