Maximum supercurrent in two Josephson-junction stacks: Theory and experiment

Fluxons and their interactions in a system of three stacked Josephson junctions

“…This interaction was first studied in the case of two junctions by Mineev et al 10 and later it was widely investigated. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] The symmetry between the two equations in the case of two junctions may hide some important aspects of the fluxon motion. In order to investigate the general properties of a system of an arbitrary number of junctions we study the case of three junctions.…”

Radio-frequency properties of stacked long Josephson junctions with nonuniform bias current distribution

“…8 it was concluded that for the particular sample geometry used ͑i.e., two overlap junctions with the possibility to independently bias both junctions͒ the bias current distribution could be either the normal one for single long junctions without a ground plane, i.e., with spikes at the edges, it could be a uniform distribution, or it could be a distribution intermediate between the two. The distribution depends on how the bias current is fed into the junctions in the stack.…”

“…In Ref. 8 the consequences of such complicated distributions for the magnetic field diffraction pattern was investigated. Here we will investigate how it affects the microwave coupling.…”

“…The stacked junctions, however, may give rise to some peculiar current distributions-depending on the geometry and the bias conditions 8 -that affect the microwave properties in a more complicated way than for single junctions. This article intends to address such problems.…”