Topological (Sliced) Doping of a 3D Peierls System: Predicted Structure of Doped BaBiO3

Abstract

At hole concentrations below x=0.4, Ba_(1-x)K_xBiO_3 is non-metallic. At x=0, pure BaBiO3 is a Peierls insulator. Very dilute holes create bipolaronic point defects in the Peierls order parameter. Here we find that the Rice-Sneddon version of Peierls theory predicts that more concentrated holes should form stacking faults (two-dimensional topological defects, called slices) in the Peierls order parameter. However, the long-range Coulomb interaction, left out of the Rice-Sneddon model, destabilizes slices in favor of point bipolarons at low concentrations, leaving a window near 30% doping where the sliced state is marginally stable.

6 pages with 5 embedded postscript figures

References in corpus (3)

• Why stripes? Spontaneous formation of inhomogeneous structures due to elastic interactions
• Polaron and Bipolaron Defects in a Charge Density Wave: a Model for Lightly Doped BaBiO3
• Self-Trapped Exciton Defects in a Charge Density Wave: Electronic Excitations of BaBiO3

Cited by in corpus (4)

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• Quantum Monte Carlo study of lattice polarons in the two-dimensional multi-orbital Su-Schrieffer-Heeger model
• Local inversion-symmetry breaking in a bismuthate high-$T_c$ superconductor