Wikipedia
Niobium-germanium
Niobium-germanium (NbGe) is a metallic chemical compound of niobium (Nb) and germanium (Ge). It has A15 phase structure.
It is a superconductor with a critical temperature of 23.2 kelvin (K).
Sputtered films have been reported to have an upper critical field of 37 teslas at 4.2 K.