Volume 72, Number 2, October 2005
|Page(s)||275 - 281|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||21 September 2005|
X-ray absorption of and : Competition between bipolaronic and charge-density wave states
Institut für Kristallographie, RWTH Aachen Jägerstraße 17-19, D-52066 Aachen, Germany
2 Forschungszentrum Karlsruhe, Institut für Festkörperphysik D-76021 Karlsruhe, Germany
3 Naval Research Laboratory, Code 6345 - Washington, DC 20375, USA
4 Department of Physics, Montana State University - Bozeman, MT 59717-3840, USA
5 Institute of Solid State and Semiconductor Physics, Academy of Sciences Minsk 220072, Belarus
Corresponding author: email@example.com
Accepted: 30 August 2005
Bulk-sensitive O near-edge X-ray absorption spectroscopy on and single crystals shows for undoped a distinct charge-density wave derived band slightly above the Fermi level; upon K doping it is effectively reduced and competes with bipolaronic hole states whose spectral weight increases with K content. For Pb doping, on the other hand, a wide Pb-O band is formed near EF while the intensity of the bipolaronic hole band remains unaffected. The data suggest a crucial role of hole bipolarons for bismuthate superconductivity.
PACS: 74.25.Jb – Electronic structure of bulk materials / 74.20.Mn – Nonconventional mechanisms / 78.70.Dm – X-ray absorption spectra
© EDP Sciences, 2005
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