Growth windows of epitaxial ${\text{Nb}}_x\text{N}$ films on c-plane sapphire and their structural and superconducting properties

John G. Wright, Huili G. Xing, Debdeep Jena

NbN films are grown on c-plane sapphire substrates by molecular beam epitaxy. The structural and superconducting properties of the film are characterized to demonstrate that growth…