Theory of Andreev reflection in junctions with iron-based High-$T_c$ superconductors

Abstract

We construct a theory for low-energy quantum transport in normal$\mid$superconductor junctions involving the recently discovered iron-based high-$T_c$ superconductors. We properly take into account both Andreev bound surface states and the complex Fermi surface topology in our approach, and investigate the signatures of the possible order parameter symmetries for the FeAs-lattice. Our results could be helpful in determining the symmetry of the superconducting state in the iron-pnicitide superconductors.

4 pages, 3 figures. Submitted to Physical Review

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• Novel properties in Josephson junctions involving the cos(kx)cos(ky)-pairing state in iron-pnictides
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• Surface density of states of s+-wave Cooper pairs in a two-band model
• Investigation of Superconducting Gap Structure in TbFeAsO${}_{0.9}$F${}_{0.1}$ using Point Contact Andreev Reflection
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• Determination of Superconducting Gap of SmFeAsFxO1-x Superconductors by Andreev Reflection Spectroscopy
• Superconducting monolayer deposited on substrate: effects of the spin-orbit coupling induced by proximity effects
• Surface Bound States in n-band Systems with Quasiclassical Approach
• Theory of vortex structure in Josephson junctions with multiple tunneling channels: Vortex enlargement as a probe of $\pm s$-wave superconductivity
• Charge and spin transport through a ferromagnet/insulator/unconventional superconductor junction
• Theory of tunnelling into a multi-band superconductor: decoherence and interference
• Theory of macroscopic quantum tunneling with Josephson-Leggett collective excitations in multi-band superconducting Josephson junctions
• Impurity Scattering Rate and Coherence factor in Vortex Core of Sign-reversing s-wave Superconductors
• Does a ferromagnet with spin-dependent masses produce a spin-filtering effect in a ferromagnetic/insulator/superconductor junction?
• Order parameter sign-reversal near $s_{\pm }$-superconductor surface
• Differential conductance of point contacts between an iron-based superconductor and a normal metal