Theory of Multiband Superconductivity in Iron Pnictides

Abstract

The precise nature of unconventional superconductivity in Iron Pnictides is presently a hotly debated issue. Here, using insights from normal state electronic structure and symmetry arguments, we show how an unconventional SC emerges from the bad metal "normal" state. Short-ranged, multi-band spin- and charge correlations generates nodeless SC in the active planar $d_{xz,yz}$ bands, and an inter-band proximity effect induces out-of-plane gap nodes in the passive $d_{3z^2-r^2}$ band. While very good quantitative agreement with various key observations in the SC state and reconciliation with NMR and penetration depth data in the same picture are particularly attractive features of our proposal, clinching evidence would be an experimental confirmation of c-axis nodes in future work.

4 pages, 2 eps figures, submitted to PRL, text modified

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Cited by in corpus (17)

• High-temperature superconductivity in iron-based materials
• Nodal superconducting gap structure in ferropnictide superconductor BaFe2(As0.7P0.3)2
• Nodes in the gap structure of the iron-arsenide superconductor Ba(Fe_{1-x}Co_x)_2As_2 from c-axis heat transport measurements
• Neutron and ARPES Constraints on the Couplings of the Multiorbital Hubbard Model for the Pnictides
• Impurity-induced bound states in iron-based superconductors with s-wave cos(kx)cos(ky) pairing symmetry
• Three-dimensional nodal superconducting gap in single crystals Ba(Fe${}_{1-x}$Ni${}_x$)${}_2$As${}_2$
• Quasiparticle Scattering Interference in Superconducting Iron-pnictides
• Unconventional Mott Transition in KxFe2-ySe2
• Microscopic description of insulator-metal transition in high-pressure oxygen
• Interorbital pair scattering in clean and impure superconductors
• Quantum Criticality in the 122 Iron Pnictide Superconductors Emerging from Orbital-Selective Mottness
• Theory of Magnetic Fluctuations in Iron Pnictides
• Effects of single- and multi-substituted Zn ions in doped-122 type iron-based superconductors
• Temperature and doping dependence of normal state spectral properties in a two-orbital model for ferropnictides
• A scenario for the critical fluctuations near the transition of few-bilayer films of high-temperature cuprate superconductors
• Phase diagram of the isovalent phosphorous-substituted 122-type iron pnictides
• Microscopic Description of Unconventional Nodal Superconductivity in FeSe