Doping dependence of the electronic structure of Ba1-xKx-BiO3 studied by x-ray-absorption spectroscopy

K. Kobayashi, Takashi Mizokawa, A. Ino, J. Matsuno, A. Fujimori, H. Samata, A. Mishiro, Y. Nagata, F. M F De Groot

Research output: Contribution to journalArticle

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Abstract

We have performed x-ray-absorption spectroscopy (XAS) and x-ray-photoemission spectroscopy (XPS) studies of single crystal Ba1-xKxBiO3 (BKBO) covering the whole composition range 0≤x≤0.60. Several features in the oxygen 1s core XAS spectra show systematic changes with x. Spectral weight around the absorption threshold increases with hole doping and shows a finite jump between x=0.30 and 0.40, which signals the metal-insulator transition. We have compared the obtained results with band-structure calculations. Comparison with the XAS results of BaPb1-xBixO3 has revealed quite different doping dependences between BKBO and BPBO. We have also observed systematic core-level shifts in the XPS spectra as well as in the XAS threshold as functions of x, which can be attributed to a chemical potential shift accompanying the hole doping. The observed chemical potential shift is found to be slower than that predicted by the rigid band model based on the band-structure calculations.

Original languageEnglish
Pages (from-to)15100-15106
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume59
Issue number23
Publication statusPublished - 1999
Externally publishedYes

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Absorption spectroscopy
x ray absorption
x ray spectroscopy
Electronic structure
absorption spectroscopy
Doping (additives)
electronic structure
X rays
shift
photoelectric emission
Chemical potential
Photoelectron spectroscopy
Band structure
thresholds
spectroscopy
Metal insulator transition
coverings
x rays
Core levels
insulators

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Kobayashi, K., Mizokawa, T., Ino, A., Matsuno, J., Fujimori, A., Samata, H., ... De Groot, F. M. F. (1999). Doping dependence of the electronic structure of Ba1-xKx-BiO3 studied by x-ray-absorption spectroscopy. Physical Review B - Condensed Matter and Materials Physics, 59(23), 15100-15106.

Doping dependence of the electronic structure of Ba1-xKx-BiO3 studied by x-ray-absorption spectroscopy. / Kobayashi, K.; Mizokawa, Takashi; Ino, A.; Matsuno, J.; Fujimori, A.; Samata, H.; Mishiro, A.; Nagata, Y.; De Groot, F. M F.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 59, No. 23, 1999, p. 15100-15106.

Research output: Contribution to journalArticle

Kobayashi, K, Mizokawa, T, Ino, A, Matsuno, J, Fujimori, A, Samata, H, Mishiro, A, Nagata, Y & De Groot, FMF 1999, 'Doping dependence of the electronic structure of Ba1-xKx-BiO3 studied by x-ray-absorption spectroscopy', Physical Review B - Condensed Matter and Materials Physics, vol. 59, no. 23, pp. 15100-15106.
Kobayashi, K. ; Mizokawa, Takashi ; Ino, A. ; Matsuno, J. ; Fujimori, A. ; Samata, H. ; Mishiro, A. ; Nagata, Y. ; De Groot, F. M F. / Doping dependence of the electronic structure of Ba1-xKx-BiO3 studied by x-ray-absorption spectroscopy. In: Physical Review B - Condensed Matter and Materials Physics. 1999 ; Vol. 59, No. 23. pp. 15100-15106.
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