$\pi$-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.

arXiv commentThe published version

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• Ground state, collective mode, phase soliton and vortex in multiband superconductors
• Ambegaokar-Baratoff relations of Josephson critical current in heterojunctions with multi-gap superconductors
• The Josephson current in Fe-based superconducting junctions: theory and experiment
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• Proximity fingerprint of s+- superconductivity
• Josephson current and density of states in proximity circuits with s+- superconductors
• Realization of the $\pi$-state in junctions formed by multi-band superconductors with a spin-density-wave
• Quantum Waveguide Theory of the Josephson effect in Multiband Superconductors
• Probing the Order Parameter of Superconducting LiFeAs using Pb/LiFeAs and Au/LiFeAs Point-Contact Spectroscopy
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• Fractional Flux Plateau in Magnetization Curve of Multicomponent Superconductor Loop
• Atomic-scale Frustrated Josephson Coupling and Multi-condensate Visualization in FeSe
• Quasiclassical circuit-theory of contiguous disordered multiband superconductors
• Josephsonic diagnostic of competing orders in quantum critical multiband superconductors
• Effects of order parameter self-consistency in a $s_{\pm }$-s junction