Possible pi-phase shift at interface of two pnictides with antiphase s-wave pairing

Abstract

We examine the nature of Josephson junction between two identical Fe-pnictides with anti-phase s-wave pairing. pi-phase shift is found if the junction barrier is thick and the two Fe-pnictides are oriented in certain directions relative to the interface. Our theory provides a possible explanation for the observed half integer flux quantum transitions in a niobium/polycrystal NdFeAsO loop, and attributes the pi-phase shift to intergrain junctions of Fe-pnictides.

4 pages, 2 figures

References in corpus (19)

• Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
• Funtional Renormalization Group Study of the Pairing Symmetry and Pairing Mechanism of the FeAs Based High Temperature Superconductors
• A Numerical Renormalization Group Study of the Superconducting and Spin Density Wave Instabilities in MFeAsO${}_{1-x}$F${}_x$ Compounds
• Pairing Symmetry in a Two-Orbital Exchange Coupling Model of Oxypnictides
• Fermi surface nesting induced strong pairing in iron-based superconductors
• The BCS-like gap in superconductor SmFeAsO_0.85F_0.15
• Multiband magnetism and superconductivity in Fe-based compounds
• Spin Fluctuations, Interband Coupling, and Unconventional Pairing in Iron-based Superconductors
• Integer and half-integer flux-quantum transitions in a niobium/iron-pnictide loop
• Evidence for Nodal Superconductivity in LaFePO from Scanning SQUID Susceptometry
• Observation of the Josephson effect in Pb/(Ba,K)Fe2As2 single crystal junctions
• Theory for Superconductivity in Iron Pnictides at Large Coulomb U Limit
• Possible phase-sensitive tests of pairing symmetry in pnictide superconductors
• Experimental Detection of Sign-Reversal Pairing in Iron-Based Superconductors
• Novel properties in Josephson junctions involving the cos(kx)cos(ky)-pairing state in iron-pnictides
• $\pi$-junction to probe antiphase s-wave pairing in iron pnictide superconductors
• Tunneling of Bloch electrons through vacuum barrier

Cited by in corpus (4)

• 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
• Realization of the $\pi$-state in junctions formed by multi-band superconductors with a spin-density-wave
• Modulation of pairing symmetry with bond disorder in unconventional superconductors