Overlap Josephson Junctions Research Articles

Dependence of fluxon dynamics on loaded terminations in long overlap Josephson junctions

Fluxon motion in long overlap-geometry Josephson junctions influenced by loaded terminations is investigated. The combination of results from a perturbation method with an approximate expression for the emitted power yields equations describing the fluxon dynamics. The form of the first zero field step is presented for various parameters and the emitted power is calculated.

An analysis of fluxons in long Josephson junctions

Fluxon propagation in long overlap and inline Josephson junctions is analyzed in the framework of the perturbed sine-Gordon model. The analysis leads to analytical expressions for the zerofield steps, the magnetic field dependence of these, and the line-width of the microwave radiation emitted from the overlap junction. Some of the results are compared to experiments on real junctions.

Perturbation calculation of magnetic field dependence of fluxon dynamics in long inline and overlap Josephson junctions

The motion of a single fluxon in long Josephson-junctions of overlap and inline geometries is investigated in the presence of an applied external magnetic field. The form of the first zero-field step for various parameters is given in closed analytic forms in both cases, and the differences and similarities between the two geometries are emphasized.

Fluxon propagation in long overlap Josephson junctions

We report here the first preliminary results of an experimental and theoretical study of long Josephson junction behaviour to assess the applicability of the recently developed fluxon propagation formalism to a real experimental situation. The frequency dependence of the microwave radiation emitted by long, overlap junctions (including changes induced by externally-applied magnetic fields) has been measured and is found to be in good agreement with the numerically calculated response of the junction.

Temperature behavior of zero-field-steps in long NbPb Josephson tunnel junctions

Abstract The temperature dependence of the dc maximum current amplitude of the dc current singularities (zero-field steps) is measured on a set of long NbPb overlap Josephson junctions in the absence of external magnetic fields. Experimental data are analized in the framework of the fluxon propagation model.

DC current singularities in long Josephson tunnel junctions: Approximate solutions of the sine-Gordon equation with loss and bias

We construct approximate analytic solutions of the sine-Gordon equation with loss and bias, which describe the fluxon propagation in long overlap Josephson junctions. By these solutions a qualitative explanation of the main observed features of the DC current singularities can be easily obtained.