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Photoemission and x-ray absorption study of superconducting and semiconducting Ba1-xKxBiO3 single crystals

Qvarford, M.; Nazin, V. G.; Zakharov, A. A. LU ; Mikheeva, M. N.; Andersen, J. N. LU ; Johansson, Mikael LU ; Chiaia, G.; Rogelet, T.; Söderholm, S. and Tjernberg, O., et al. (1996) In Physical Review B (Condensed Matter) 54(9). p.6700-6707
Abstract

Semiconducting Ba0.9K0.1BiO3 and superconducting Ba0.6K0.4BiO3 single crystals cleaved in situ have been studied by core level and valence band photoelectron spectroscopy and O K edge x-ray absorption spectroscopy. It was found that the general shape of the valence band spectrum agrees with the shape predicted by band structure calculations, but the intensity near the Fermi level was lower in the experimental spectrum as compared to the calculated. The O K edge spectra showed that the metallic phase is not related to the presence of doping inducted O 2p holes. This property of Ba1-xKxBiO3 shows that the semiconductor-metal transition of... (More)

Semiconducting Ba0.9K0.1BiO3 and superconducting Ba0.6K0.4BiO3 single crystals cleaved in situ have been studied by core level and valence band photoelectron spectroscopy and O K edge x-ray absorption spectroscopy. It was found that the general shape of the valence band spectrum agrees with the shape predicted by band structure calculations, but the intensity near the Fermi level was lower in the experimental spectrum as compared to the calculated. The O K edge spectra showed that the metallic phase is not related to the presence of doping inducted O 2p holes. This property of Ba1-xKxBiO3 shows that the semiconductor-metal transition of this system is of a different nature than that of the hole doped cuprate high-Tc superconductors. The core level photoemission spectra of the cations showed a small asymmetry for Ba0.9K0.1BiO3. Corresponding spectra for Ba0.6K0.4BiO3 showed a larger asymmetry resulting in a resolved high binding energy shoulder in the Bi 4f spectrum. The origin of this feature is discussed.

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Physical Review B (Condensed Matter)
volume
54
issue
9
pages
8 pages
publisher
American Physical Society
external identifiers
  • scopus:0007017663
ISSN
0163-1829
DOI
10.1103/PhysRevB.54.6700
language
English
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yes
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1d9cd4d2-4302-499e-98a8-0c5d4aea5e32
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2016-04-29 10:55:59
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2017-10-22 05:14:31
@article{1d9cd4d2-4302-499e-98a8-0c5d4aea5e32,
  abstract     = {<p>Semiconducting Ba<sub>0.9</sub>K<sub>0.1</sub>BiO<sub>3</sub> and superconducting Ba<sub>0.6</sub>K<sub>0.4</sub>BiO<sub>3</sub> single crystals cleaved in situ have been studied by core level and valence band photoelectron spectroscopy and O K edge x-ray absorption spectroscopy. It was found that the general shape of the valence band spectrum agrees with the shape predicted by band structure calculations, but the intensity near the Fermi level was lower in the experimental spectrum as compared to the calculated. The O K edge spectra showed that the metallic phase is not related to the presence of doping inducted O 2p holes. This property of Ba<sub>1-x</sub>K<sub>x</sub>BiO<sub>3</sub> shows that the semiconductor-metal transition of this system is of a different nature than that of the hole doped cuprate high-T<sub>c</sub> superconductors. The core level photoemission spectra of the cations showed a small asymmetry for Ba<sup>0.9</sup>K<sub>0.1</sub>BiO<sub>3</sub>. Corresponding spectra for Ba<sub>0.6</sub>K<sub>0.4</sub>BiO<sub>3</sub> showed a larger asymmetry resulting in a resolved high binding energy shoulder in the Bi 4f spectrum. The origin of this feature is discussed.</p>},
  author       = {Qvarford, M. and Nazin, V. G. and Zakharov, A. A. and Mikheeva, M. N. and Andersen, J. N. and Johansson, Mikael and Chiaia, G. and Rogelet, T. and Söderholm, S. and Tjernberg, O. and Nylén, H. and Lindau, I. and Nyholm, R. and Karlsson, U. O. and Barilo, S. N. and Shiryaev, S. V.},
  issn         = {0163-1829},
  language     = {eng},
  month        = {09},
  number       = {9},
  pages        = {6700--6707},
  publisher    = {American Physical Society},
  series       = {Physical Review B (Condensed Matter)},
  title        = {Photoemission and x-ray absorption study of superconducting and semiconducting Ba1-xKxBiO3 single crystals},
  url          = {http://dx.doi.org/10.1103/PhysRevB.54.6700},
  volume       = {54},
  year         = {1996},
}