Spectral functions in doped transition metal oxides

Details Spectral functions in doped transition metal oxides Spectral functions in doped transition metal oxides

1996-09-25

arxiv.org/abs/cond-mat/9609259v1

Physics

Condensed Matter

10 pages; 1 tex file+4 postscript files (to appear in Europhysics Letters)

Scientific paper

10.1209/epl/i1996-00227-1

We present experimental photoemission and inverse photoemission spectra of SrTiO$_{3- \delta}$ representing electron doped $d^0$ systems. Photoemission spectra in presence of electron doping exhibit prominent features arising from electron correlation effects, while the inverse photoemssion spectra are dominated by spectral features explainable within single-particle approaches. We show that such a spectral evolution in chemically doped correlated systems is not compatible with expectations based on Hubbard or any other similar model. We present a new theoretical approach taking into account the inhomogeneity of the `real' system which gives qualitatively different results compared to standard `homogeneous' models and is in quantitative agreement with experiments.

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