Non-Fraunhofer patterns of the anharmonic Josephson current influenced by a strong interfacial pair breaking

TL;DR

This paper investigates how strong interfacial pair breaking in Josephson junctions causes significant deviations from standard Fraunhofer patterns, revealing unique magnetic interference behaviors.

Contribution

It demonstrates the impact of strong Josephson coupling and interfacial pair breaking on the magnetic interference patterns of the Josephson current, highlighting non-Fraunhofer features.

Findings

Non-Fraunhofer magnetic field modulation of critical current

Narrow peak at zero magnetic field

Suppressed hills at finite magnetic fields

Abstract

In the junctions with a strong Josephson coupling and a pronounced interfacial pair breaking, the magnetic interference patterns of the Josephson current are shown to differ substantially from the standard Fraunhofer shape. The Fraunhofer pattern occurs, when Josephson couplings are weak. The narrow peak of the critical current, centered at the zero magnetic field, and the suppressed hills at finite field values are the characteristic features of the non-Fraunhofer magnetic field modulation of the critical current, obtained in this paper.