The critical current of point symmetric Josephson tunnel junctions

Superelliptic Josephson Tunnel Junctions

The most important practical characteristic of a Josephson junction is its critical current. The shape of the junction determines the specific form of the magnetic-field dependence of the its Josephson current. Here we address the magnetic diffraction patterns of specially shaped planar Josephson tunnel junctions. We focus on a wide ensemble of generalized ellipses, called superellipses, which ...

Microscopic model of critical current noise in Josephson junctions.

We present a simple microscopic model to show how fluctuating two-level systems in a Josephson junction tunnel barrier of thickness L can modify the potential energy of the barrier and produce critical current noise spectra. We find low frequency 1/f noise that goes as L5. Our values are in good agreement with recent experimental measurements of critical current noise in Al/AlOx/Al Josephson ju...

Critical current calculations for long 0-π Josephson junctions

A zigzag boundary between a dx2−y2 and an s-wave superconductor is believed to behave like a long Josephson junction with alternating sections of 0 and π symmetry. We calculate the field-dependent critical current of such a junction, using a simple model. The calculation involves discretizing the partial differential equation for the phase difference across a long 0-π junction. In this form, th...

Current-voltage characteristics of tunnel Josephson junctions with a ferromagnetic interlayer

A. S. Vasenko,1,2,3 S. Kawabata,4 A. A. Golubov,5 M. Yu. Kupriyanov,6 C. Lacroix,7 F. S. Bergeret,3,8 and F. W. J. Hekking2 1Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156, F-38042 Grenoble, France 2LPMMC, Université Joseph Fourier and CNRS, 25 avenue des Martyrs, BP 166, F-38042 Grenoble, France 3Donostia International Physics Center (DIPC), Manuel de Lardizabal 4, E-20018 San Sebastián,...

Spatial dependence of plasma oscillations in Josephson tunnel junctions.