Magnetic interference pattern in planar SNS Josephson junctions

Abstract

We study the Josephson current through a ballistic normal metal layer of thickness $D$ on which two superconducting electrodes are deposited within a distance $L$ of each other. In the presence of an ({\it in-layer}) magnetic field we find that the oscillations of the critical current $I_c(\Phi )$ with the magnetic flux $\Phi$ are significantly different from an ordinary magnetic interference pattern. Depending on the ratio $L/D$ and temperature, $I_c(\Phi )$-oscillations can have a period smaller than flux quantum ${\Phi }_0$, nonzero minima and damping rate much smaller than $1/\Phi$. Similar anomalous magnetic interference pattern was recently observed experimentally.

6 pages, 4 figures, Accepted by Phys. Rev. B

References in corpus (5)

• A spin triplet supercurrent through the half-metallic ferromagnet CrO2
• Half-integer Shapiro steps at the 0-pi crossover of a ferromagnetic Josephson junction
• Superharmonic Josephson relation at 0-/$\pi$-junction transition
• Nonsinusoidal current-phase relations and the $0-\pi$ transition in diffusive ferromagnetic Josephson junctions
• sin(2 phi) current-phase relation in SFS junctions with decoherence in the ferromagnet