Barrier properties of superconducting structures based on niobium nitride and a molybdenum–rhenium alloy

Abstract

Stable superconducting structures of the metal–insulator–metal type are made using niobium nitride. A comparison of the measured current–voltage characteristics with the theoretical curves calculated with allowance for possible fluctuations in the transparency of the insulating spacer layer shows that the potential barrier formed as a result of the oxidation of NbN is quite uniform. The possibility of making niobium nitride Josephson junctions for superconducting micro- and nanoelectronics is discussed.