| Issue |
Europhys. Lett.
Volume 36, Number 4, November I 1996
|
|
|---|---|---|
| Page(s) | 307 - 312 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1996-00227-1 | |
| Published online | 01 September 2002 | |
Spectral functions in doped transition metal oxides
1
Solid State and Structural Chemistry Unit, Indian Institute of
Science,
Bangalore 560012, India
2
Serin Physics Laboratory, Rutgers University, Piscataway, NJ 08855, USA
Received:
3
June
1996
Accepted:
16
September
1996
We present experimental photoemission and inverse photoemission
spectra of 
representing electron-doped 
systems. Photoemission spectra in the presence of electron doping exhibit
prominent features arising from electron correlation effects, while
the inverse photoemission 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.
PACS: 79.60.Bm – Clean metal, semiconductor, and insulator surfaces / 79.60.Ht – Disordered structures / 71.30.+h – Metal-insulator transitions
© EDP Sciences, 1996
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