Effects of hole doping and electron-phonon interaction on the electronic structure of Ba1-xKxBiO3 studied by photoemission spectroscopy

H. Namatame, A. Fujimori, H. Torii, T. Uchida, Y. Nagata, J. Akimitsu

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32 Citations (Scopus)

Abstract

The electronic structure of Ba1-xKxBiO3 has been studied by photoemission spectroscopy. With increasing x, the spectra are generally shifted towards the Fermi level (EF), indicating a downward shift of EF due to hole doping. The magnitudes of the shifts, however, are substantially smaller than those predicted by band-structure calculations. In the cubic metallic phase, although band-structure calculations on the cubic structure predict the density of states (DOS) to show a peak at or close to EF, the photoemission intensity decreases towards EF, suggesting that the splitting of the Bi 6s band persists and results in a pseudogap behavior. We propose that the suppression of the DOS peak at EF is caused by dynamical lattice distortion: The DOS peak predicted for the cubic structure presumably induces the lattice instability, leading to the dynamical lattice distortion.

Original languageEnglish
Pages (from-to)13674-13678
Number of pages5
JournalPhysical Review B
Volume50
Issue number18
DOIs
Publication statusPublished - Jan 1 1994
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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