$\pi$-junction to probe antiphase s-wave pairing in iron pnictide superconductors

Abstract

Josephson junctions between a $FeAs$-based superconductor with antiphase s-wave pairing and a conventional s-wave superconductor are studied. The translational invariance in a planar junction between a single crystal pnictide and an aluminum metal greatly enhances the relative weight of electron pockets in the pnictide to the critical current. In a wide doping region of the pnictide, a planar and a point contact junctions have opposite phases, which can be used to design a tri-junction ring with $\pi$ phase to probe the antiphase pairing.

The published version

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Cited by in corpus (8)

• High-temperature superconductivity in iron-based materials
• Iron based high transition temperature superconductors
• Josephson effect between a two-band superconductor with the s++ or s+- pairing symmetry and a conventional s-wave superconductor
• Ground state, collective mode, phase soliton and vortex in multiband superconductors
• Metastable $\pi$-junction between an s${}_{\pm }$-wave and an s-wave superconductor
• Realization of the $\pi$-state in junctions formed by multi-band superconductors with a spin-density-wave
• Possible pi-phase shift at interface of two pnictides with antiphase s-wave pairing
• Atomic-scale Frustrated Josephson Coupling and Multi-condensate Visualization in FeSe