Arrays of high temperature superconductor Josephson junctions

The authors present results on parallel, series, and two-dimensional arrays of high-temperature superconductor junctions. The parallel arrays show the expected field dependence of critical current and can function as vortex flow transistors. The series arrays give data about the spread in junction critical currents for the present process. The two-dimensional arrays show many of the phenomena previously observed in low-T/sub c/ technology, such as field frustration of the phase transition, some evidence for superlattice states, and the tentative indications of giant Shapiro steps, showing large-scale cooperative behavior in the device.<>