Optical conductivity of nonmetallic Ba0.69K0.31BiO3 single crystals: Evidence for bipolaron formation

A. V. Puchkov, T. Timusk, M. A. Karlow, S Lance Cooper, P. D. Han, D. A. Payne

Research output: Contribution to journalArticle

Abstract

We report the far-infrared to near-ultraviolet reflectivity and ellipsometric measurements on an insulating Ba1-xKxBiO3 single crystal, with a doping level x=0.31 just below the insulator-metal transition boundary. The optical conductivity was calculated using Kramers-Kronig analysis. We examine the experimental data in terms of a small bipolaron model. This model, with no free parameters, allows us to obtain a satisfactory agreement with our experimental results, including the overall shape and the peculiar temperature dependence of the optical conductivity. The same model provides a qualitative explanation for some aspects of the transport-measurement results reported previously.

Original languageEnglish (US)
JournalPhysical Review B
Volume52
Issue number14
DOIs
StatePublished - Jan 1 1995

ASJC Scopus subject areas

  • Condensed Matter Physics

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