Electronic structure in the band gap of lightly doped SrTiO3 by high-resolution x-ray absorption spectroscopy

T. Higuchi, T. Tsukamoto, K. Kobayashi, Y. Ishiwata, M. Fujisawa, Takayoshi Yokoya, S. Yamaguchi, S. Shin

Research output: Contribution to journalArticle

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Abstract

The electronic structure of lightly Nb-doped SrTiO3 has been investigated using high resolution x-ray absorption spectroscopy (XAS). Below the O 1s threshold, XAS spectra show two features due to empty states whose energy positions match with those of the 3d photoemission spectra in the band gap energy region of the parent undoped SrTiO3. Similar features are also observed in lightly La-doped SrTiO3. These features exhibit systematic temperature dependence, which is well explained by the Fermi-Dirac distribution function. This indicates that the two features in the band gap are real bulk states such as simple donor states.

Original languageEnglish
Pages (from-to)12860-12863
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume61
Issue number19
Publication statusPublished - 2000
Externally publishedYes

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Absorption spectroscopy
x ray absorption
x ray spectroscopy
Electronic structure
absorption spectroscopy
Energy gap
electronic structure
X rays
high resolution
Photoemission
Electron energy levels
Distribution functions
photoelectric emission
distribution functions
temperature dependence
thresholds
Temperature
strontium titanium oxide
energy

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Electronic structure in the band gap of lightly doped SrTiO3 by high-resolution x-ray absorption spectroscopy. / Higuchi, T.; Tsukamoto, T.; Kobayashi, K.; Ishiwata, Y.; Fujisawa, M.; Yokoya, Takayoshi; Yamaguchi, S.; Shin, S.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 61, No. 19, 2000, p. 12860-12863.

Research output: Contribution to journalArticle

Higuchi, T, Tsukamoto, T, Kobayashi, K, Ishiwata, Y, Fujisawa, M, Yokoya, T, Yamaguchi, S & Shin, S 2000, 'Electronic structure in the band gap of lightly doped SrTiO3 by high-resolution x-ray absorption spectroscopy', Physical Review B - Condensed Matter and Materials Physics, vol. 61, no. 19, pp. 12860-12863.
Higuchi, T. ; Tsukamoto, T. ; Kobayashi, K. ; Ishiwata, Y. ; Fujisawa, M. ; Yokoya, Takayoshi ; Yamaguchi, S. ; Shin, S. / Electronic structure in the band gap of lightly doped SrTiO3 by high-resolution x-ray absorption spectroscopy. In: Physical Review B - Condensed Matter and Materials Physics. 2000 ; Vol. 61, No. 19. pp. 12860-12863.
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