Title :
The critical current-field dependence of a Josephson superlattice
Author :
Amin, H. ; Blamire, M.G. ; Evetts, J.E.
Author_Institution :
Dept. of Mater. Sci., Cambridge Univ., UK
fDate :
3/1/1993 12:00:00 AM
Abstract :
The set of coupled nonlinear equations that describes the phase in the Josephson superlattice is presented. Numerical solutions for the simplest of the stacked junction systems, the two-junction system, are investigated in the stationary state for a number of cases of differing critical current densities and junction spacings as a function of parallel applied magnetic field. The results show that the behavior of the system is determined to a great extent by the higher J/sub c/ junction. The numerical solutions are compared with experimental results obtained from SISIS (superconductor-insulator-superconductor-insulator-superconductor) devices (where the superconductor is Nb and the insulator is Al/sub 2/O/sub 3/) and their significance for the Fraunhofer response of high-T/sub c/ bijunction structures is discussed.<>
Keywords :
Josephson effect; critical current density (superconductivity); superconducting junction devices; superconducting superlattices; Fraunhofer response; Josephson superlattice; Nb-Al/sub 2/O/sub 3/ based systems; coupled nonlinear equations; critical current-field dependence; high-T/sub c/ bijunction structures; stacked junction systems; stationary state; two-junction system; Couplings; Critical current density; Insulation; Josephson junctions; Magnetic fields; Magnetic superlattices; Niobium; Nonlinear equations; Stationary state; Superconducting devices;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
