Josephson Junction Technology Based on High-Temperature Superconductors

Recent Progress and Current Subject of HTS Josephson Junctions

Abstract

An overview of present Josephson junctions based on high-temperature superconductors (HTSs) is described. I indicate the importance of the critical current-normal resistance (I_cR_n) product, and show the experimentally-obtained values of the I_cR_n products for the HTS Josephson junctions reported so far. The junctions include grain boundary junctions, edge junctions, and sandwich junctions. Considering the charge transport mechanism across the junctions, effective ways to increase the I_cR_n product are proposed.