Polaron and Bipolaron Defects in a Charge Density Wave: a Model for Lightly Doped BaBiO3

Details Polaron and Bipolaron Defects in a Charge Density Wave: a Model for Lightly Doped BaBiO3 Polaron and Bipolaron Defects in a Charge Density Wave: a Model for Lightly Doped BaBiO3

2001-08-05

arxiv.org/abs/cond-mat/0108089v1

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages with 8 embedded figures. See also cond-mat/0108089, a paper of 5 pages on the related topic of self-trapped excitons i

Scientific paper

10.1103/PhysRevB.65.115112

BaBiO3 is a prototype ``charge ordering system'' forming interpenetrating sublattices with nominal valence Bi(3+) and Bi(5+). It can also be regarded as a three-dimensional version of a Peierls insulator, the insulating gap being a consequence of an ordered distortion of oxygen atoms. 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. The mechanism for insulating behavior of more lightly-doped samples is formation of small polarons or bipolarons. These are self-organized point defects in the Peierls order parameter, which trap carriers in bound states inside the Peierls gap. We calculate properties of the polarons and bipolarons using the Rice-Sneddon model. Bipolarons are the stable defect; the missing pair of electrons come from an empty midgap state built from the lower Peierls band. Each bipolaron distortion also pulls down six localized states below the bottom of the unoccupied upper Peierls band. The activation energy for bipolaron hopping is estimated.

Affiliated with

Also associated with

No associations

Rating

Polaron and Bipolaron Defects in a Charge Density Wave: a Model for Lightly Doped BaBiO3 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Polaron and Bipolaron Defects in a Charge Density Wave: a Model for Lightly Doped BaBiO3, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polaron and Bipolaron Defects in a Charge Density Wave: a Model for Lightly Doped BaBiO3 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-440534