Superconductivity-localization interplay and fluctuation magnetoresistance in epitaxial BaPb$_{1-x}$Bi$_x$O$_3$ thin films
| Autor: | Harris, David T., Campbell, Neil, Uecker, Reinhard, Brützam, Mario, Schlom, Darrell G., Levchenko, Alex, Rzchowski, Mark S., Eom, Chang-Beom |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Phys. Rev. Materials 2, 041801 (2018) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevMaterials.2.041801 |
| Popis: | 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 $\sim100$ nm) this region extends to $\sim27$ 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. Comment: 20 pages, 8 figures |
| Databáze: | arXiv |
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