Edvin T Berhane1,Spencer Doyle1,Charles Brooks1,Julia Mundy1
Harvard University1
Edvin T Berhane1,Spencer Doyle1,Charles Brooks1,Julia Mundy1
Harvard University1
The perovskite BaBiO<sub>3</sub> exhibits superconductivity around 30 K when doped with potassium on the A-site. This is the highest observed transition temperature for an oxide superconductor without copper. BaBiO<sub>3 </sub>is also predicted to be a large-bandgap topological insulator when electron-doped. However, the topological insulator state has not been realized experimentally thus far. Here we synthesize high-quality phase-pure thin-films of BaBiO<sub>3</sub> on strontium titanate substrates using reactive-oxide molecular beam epitaxy. We study various dopings and post-growth modifications focused around achieving a superconducting or topological insulator state. X-ray diffraction, atomic force microscopy, and x-ray photoemission spectroscopy are used to characterize the quality and content of our films.