X-ray absorption of and : Competition between bipolaronic and charge-density wave states

M. Merz; N. Nücker; S. Schuppler; D. Arena; J. Dvorak; Y. U. Idzerda; S. N. Ustinovich; A. G. Soldatov; S. V. Shiryaev; S. N. Barilo

doi:10.1209/epl/i2005-10236-6

All issues

Volume 72 / No 2 (October 2005)

Europhys. Lett., 72 2 (2005) 275-281

Abstract

Issue		Europhys. Lett. Volume 72, Number 2, October 2005


Page(s)		275 - 281
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2005-10236-6
Published online		21 September 2005

Europhys. Lett., 72 (2), pp. 275-281 (2005)

X-ray absorption of $\chem{Ba_{1- \it x}K_{\it x}BiO_{3}}$ and $\chem{BaPb_{1-\it y}Bi_{\it y}O_{3}}$ : Competition between bipolaronic and charge-density wave states

M. Merz¹, N. Nücker², S. Schuppler², D. Arena³, J. Dvorak⁴, Y. U. Idzerda⁴, S. N. Ustinovich⁵, A. G. Soldatov⁵, S. V. Shiryaev⁵ and S. N. Barilo⁵

¹ 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: merz@xtal.rwth-aachen.de

Received: 14 June 2005
Accepted: 30 August 2005

Abstract

Bulk-sensitive O $1s$ near-edge X-ray absorption spectroscopy on $\chem{Ba_{1-{\it x}}K_{\it x}BiO_{3}}$ and $\chem{BaPb_{1-{\it y}}Bi_{\it y} O_{3}}$ single crystals shows for undoped $\chem{BaBiO_{3}}$ 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 E_F 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

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