Polaron defects in a charge density wave: a model for lightly doped BaBiO3 View Full Text


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Article Info

DATE

1997-12

AUTHORS

Philip B. Allen, Vladimir N. Kostur

ABSTRACT

A model for BaBiO3 was introduced by Rice and Sneddon, which treats this material as a simple three-dimensional version of a Peierls insulator, where the insulating gap is a consequence of the ordered distortion of the oxygen atoms. Charge accumulates on half the atoms and depletes from the other half. Experimentally, when holes are added to BaBiO3 by doping, it remains insulating until a very large hole concentration is reached, at which point it becomes superconducting. In the Rice-Sneddon model, at large enough electron-phonon coupling, a mechanism for insulating behavior of doped samples is formation of small polarons or bipolarons which trap carriers in bound states in the Peierls gap. A variational calculation of the polaron binding in this model is given, and compared with “exact” numerical results on large clusters with periodic boundary conditions. More... »

PAGES

613-618

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s002570050497

DOI

http://dx.doi.org/10.1007/s002570050497

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1034400294


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