φ-State and Inverted Fraunhofer Pattern in Nonaligned Josephson Junctions

Abstract

A generic nonaligned Josephson junction in the presence of an external magnetic field is theoretically considered and an unusual flux-dependent current-phase relation (CPR) is revealed. We explain the origin of the anomalous CPR via the current density flow induced by the external field within a two-dimensional quasiclassical Keldysh-Usadel framework. In particular, it is demonstrated that nonaligned Josephson junctions can be utilized to obtain a ground-state other than 0 and π, corresponding to a so-called φ-junction, which is tunable via the external magnetic flux. Furthermore, we show that the standard Fraunhofer central peak of the critical supercurrent may be inverted into a local minimum solely due to geometrical factors in planar junctions. This yields good consistency with a recent experimental measurement displaying such type of puzzling feature [R. S. Keizer et al, Nature 439, 825 (2006)].

5 pages, 4 figures. To Appear in Physical Review B: Rapid Communications

References in corpus (10)

• A spin triplet supercurrent through the half-metallic ferromagnet CrO2
• Direct coupling between magnetism and superconducting current in Josephson Phi junction
• Experimental evidence of a ϕ Josephson junction
• Proximity DC squids in the long junction limit
• Magnetic Interference Patterns and Vortices in Diffusive SNS junctions
• Magnetic-coupling-dependent spin-triplet supercurrents in helimagnet/ferromagnet Josephson junctions
• Nonequilibrium transport in mesoscopic multi-terminal SNS Josephson junctions
• Proximity Effects in Conical-Ferromagnet/Superconductor bilayers
• Magnetic interference pattern in planar SNS Josephson junctions
• Non-Fraunhofer patterns of the anharmonic Josephson current influenced by a strong interfacial pair breaking

Cited by in corpus (12)

• Magnetoelectrics in Disordered Topological Insulator Josephson Junctions
• Spin Supercurrent, Magnetization Dynamics, and Phi-State in Spin-Textured Josephson Junctions
• Spontaneous supercurrent and $\varphi$0 phase shift parallel to magnetized topological insulator interfaces
• Proximity Induced Vortices and Long-Range Triplet Supercurrents in Ferromagnetic Josephson Junctions and Spin Valves
• Pure Odd Frequency Superconductivity at the Cores of Proximity Vortices
• Spin-triplet superconductor$-$quantum anomalous Hall insulator$-$spin-triplet superconductor Josephson junctions: $0$-$\pi$ transition, ${\varphi }_0$ phase and switch effects
• Electrically modulated SQUID with single Josephson junction coupled by a time-reversal breaking Weyl semimetal thin film
• ${\theta }_0$ thermal Josephson junction
• Majorana phi0 Junction in a Disordered Spin-orbit Coupling Nanowire with Tilted Magnetic Field
• Spontaneous vortex state and $\phi$-junction in a superconducting bijunction with a localized spin
• Long-Range Triplet Supercurrents Induced by Singlet Supercurrents Parallel to Magnetic Interfaces
• Tunable ground states in helical $p$-wave Josephson junctions