Superconductivity-localization interplay and fluctuation magnetoresistance in epitaxial BaPb${}_{1-x}$Bi${}_x$O${}_3$ thin films

Abstract

BaPb${}_{1-x}$Bi${}_x$O${}_3$ is a superconductor, with transition temperature $T_c=11$ K, whose parent compound BaBiO${}_3$ possess a charge ordering phase and perovskite crystal structure reminiscent of the cuprates. The lack of magnetism simplifies the BaPb${}_{1-x}$Bi${}_x$O${}_3$ phase diagram, making this system an ideal platform for contrasting high-$T_c$ systems with isotropic superconductors. Here we use high-quality epitaxial thin films and magnetotransport to demonstrate superconducting fluctuations that extend well beyond $T_c$. For the thickest films (thickness above $\sim 100$ nm) this region extends to $\sim 27$ K, well above the bulk $T_c$ and remarkably close to the higher $T_c$ of Ba${}_{1-x}$K${}_x$BiO${}_3$ ($T_c=31$ K). We drive the system through a superconductor-insulator transition by decreasing thickness and find the observed $T_c$ correlates strongly with disorder. This material manifests strong fluctuations across a wide range of thicknesses, temperatures, and disorder presenting new opportunities for understanding the precursor of superconductivity near the 2D-3D dimensionality crossover.

arXiv comment20 pages, 8 figures

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• Charge Density Wave Modulation in Superconducting BaPbO${}_3$/BaBiO${}_3$ Superlattices
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• In-situ scattering studies of superconducting vacancy-ordered monoclinic TiO thin films
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