The Josephson current in Fe-based superconducting junctions: theory and experiment

Abstract

We present theory of dc Josephson effect in contacts between Fe-based and spin-singlet $s$-wave superconductors. The method is based on the calculation of temperature Green's function in the junction within the tight-binding model. We calculate the phase dependencies of the Josephson current for different orientations of the junction relative to the crystallographic axes of Fe-based superconductor. Further, we consider the dependence of the Josephson current on the thickness of an insulating layer and on temperature. Experimental data for PbIn/Ba${}_{1-x}$K${}_x$(FeAs)${}_2$ point-contact Josephson junctions are consistent with theoretical predictions for $s_{\pm }$ symmetry of an order parameter in this material. The proposed method can be further applied to calculations of the dc Josephson current in contacts with other new unconventional multiorbital superconductors, such as $S{r}_{2}Ru{O}_4$ and superconducting topological insulator $C{u}_{x}B{i}_{2}S{e}_3$.

16 pages, 14 figures

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• Proximity and Josephson effects in microstructures based on multiband superconductors
• Phase-sensitive evidence for the sign-reversal s+- symmetry of the order parameter in an iron-pnictide superconductor using Nb/Ba1-xNaxFe2As2 Josephson junctions
• Orbital tunable 0-$\pi$ transitions in Josephson junctions with noncentrosymmetric topological superconductors
• Influence of the Fermi surface geometry on a Josephson effect between an iron-pnictide and conventional superconductors
• Superconducting gap symmetry in BaFe${}_{1.9}$Ni${}_{0.1}$As${}_2$ superconductor
• Design and construction of a point-contact spectroscopy rig with lateral scanning capability
• Quasiparticle interference in multiband superconductors with strong coupling
• Spectroscopic signature of spin triplet odd-valley superconductivity in two-dimensional materials
• Effects of order parameter self-consistency in a $s_{\pm }$-s junction
• Theory of Josephson current on a lattice model of grain boundary in $d$-wave superconductors