Polarons formation in Bi-deficient BaBiO${}_3$

Abstract

BaBiO${}_3$ is a charged ordered Peierls-like perovskite well known for its superconducting properties upon K or Pb doping. We present a study on the transport and electronic properties of BaBiO${}_3$ perovskite with strong Bi-deficiency. We show that it is possible to synthesize BaBiO${}_3$ thin layers with Bi-vacancies above 8-10% by depositing an yttrium-stabilized zirconia capping layer. By combining transport measurements with ab initio calculations we propose an scenario where the Bi-vacancies give rise to the formation of polarons and suggest that the electrical transport is dominated by the migration of these polarons trapped at Bi${}^{3+}$ sites. Our work shows that cation vacancies engineering -- hardly explored to date -- appears as a promising pathway to tune the electronic and functional properties of perovskites.

References in corpus (13)

• Physics of thin-film ferroelectric oxides
• Hall-Effect Sign Anomaly and Small-Polaronic Conduction in (La_{1-x}Gd_x)_{0.67}Ca_{0.33}MnO_3
• A large energy-gap oxide topological insulator based on the superconductor BaBiO3
• Correlation-enhanced electron-phonon coupling: Applications of GW and screened hybrid functional to bismuthates, chloronitrides, and other high Tc superconductors
• Polaronic hole-trapping in doped $\mathrm{BaBi}{\mathrm{O}}_3$
• Hybridization effects and bond-disproportionation in the bismuth perovskites
• Momentum-Resolved Electronic Structure of the High-$T_c$ Superconductor Parent Compound BaBiO${}_3$
• Surface Structure Analysis of Atomically Smooth BaBiO${}_3$ Films
• Mechanism to Generate a Two-Dimensional Electron Gas at the Surface of the Charge-Ordered Semiconductor BaBiO3
• Interface-Driven Two-Dimensional Superconductivity in Bilayers of BaBiO${}_3$ and BaPbO${}_3$
• Stabilization of the perovskite phase in the Y-Bi-O system by using a BaBiO${}_3$ buffer layer
• Epitaxial Growth of Perovskite SrBiO${}_3$ Film on SrTiO${}_3$ by Oxide Molecular Beam Epitaxy
• 2D superconductidy driven by interfacial electron-phonon coupling at the BaPbO${}_3$/BaBiO${}_3$ bilayer