Epitaxial growth of the first two members of the Ba_<i>n</i>+1In_<i>n</i>O_{2.5<i>n</i>+1} Ruddlesden–Popper homologous series

We demonstrate the epitaxial growth of first two members, and [Formula: see text] member homologous Ruddlesden–Popper series which was previously unknown. The films were grown by suboxide molecular-beam epitaxy where indium is provided a molecular beam indium-suboxide [[Formula: text]O (g)]. To facilitate ex situ characterization highly hygroscopic barium indate films, capping layer amorphous deposited prior to air exposure. structural quality assessed x-ray diffraction, reflective high-energy electron scanning transmission microscopy.