https://www.nist.gov/publications/cosputtered-amorphous-nbxsi1-x-barriers-josephson-junction-circuits
Cosputtered Amorphous Nb_xSi_1-x Barriers for Josephson-Junction Circuits | NIST
Feb 19, 2017 - Cosputtered Amorphous NbxSi1-x has been developed as a barrier material for Josephson junction array circuits.