Magnetotransport Studies of BaPbO₃/BaBiO₃ Bilayer Thin Films

Barium lead bismuth oxide (BaPb_1-xBi_xO₃) shows a complex phase diagram with adjacent superconducting, insulating, and charge ordered states. The effects of disorder and stripe-like structural phase separation have recently been studied in bulk single crystals [P. Giraldo-Gallo et al. Nat. Comms. 6, 8231 (2015)]; here we study the effects of disorder in a model system - BaPbO₃/BaBiO₃ bilayer thin films. Low temperature magnetotransport measurements show a crossover between weak localization and antilocalization near the superconducting transition, and we extract the associated electronic dephasing and spin-orbital lifetimes.