Shapiro steps in Josephson junctions with alternating critical current density

Shapiro steps in Josephson Junctions

We use Ginzburg-Landau theory to describe the phase transition to the superconducting state and the current through a superconductor. Applying quantum mechanics to the Josephson junction following Feynmann’s method the Josephson relations for AC and DC current through the junctions is obtained. The resistively shunted Josephson junction and the resistively and capacitively shunted Josephson jun...

Shapiro Steps in BSCCO Intrinsic Josephson Junctions

Self-generated flux in Josephson junctions with alternating critical current density

We study an interesting state with a self-generated magnetic flux in a long Josephson junction. The critical current density j c is assumed to alternate randomly along the tunnel contact on a length scale much less than the local Josephson penetration depth. The phase difference is then a sum of an alternating term and a smooth term which self-consistently contribute to the formation of a stati...

Subharmonic Shapiro steps in high-Tc Josephson junctions

We studied the response of high-Tc biepitaxial grain boundary junctions to 100 GHz radiation in the presence of a magnetic field. Integer as well as subharmonic constant voltage steps are observed, even at one-fifth of the voltage separation between integer ~Shapiro! steps. Our results indicate that this behavior is due to the synchronized motion of Josephson vortices along the junction. We sho...

Determination of the current density distribution in Josephson junctions

A technique is described for recovering the missing phase information for a set of critical current measurements as a Ž . Ž . function of an applied magnetic field I B . In many cases the current density j x across the boundary for a Josephson c junction can be determined. q 1999 Published by Elsevier Science B.V. All rights reserved. PACS: 74.25.Fy; 74.25.Ha; 73.40.Gk