Momentum dependence and nodes of the superconducting gap in iron-pnictides

Abstract

We discuss the structure of the superconducting gap in iron pnictides. In the itinerant electron picture, gaps with or without nodes have the extended s-wave (s+) symmetry and emerge within the same pairing mechanism, determined by the interplay between intra-pocket repulsion and inter-band pair hopping. If the pair hopping is stronger, the system develops an s+ gap without nodes. In the opposite case the superconductivity is governed by of the momentum-dependent part of the pair-hopping, and an s+ gap shows nodes on electron Fermi surfaces. We argue that the gap without/with nodes emerges in systems with a stronger/weaker tendency towards a spin-density-wave order.

arXiv comment5pp, 3 figures

References in corpus (35)

• Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
• Magnetism, superconductivity, and pairing symmetry in Fe-based superconductors
• Is LaO${}_{1-x}$F${}_x$FeAs an electron-phonon superconductor ?
• 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
• Electronic Structure and Doping in BaFe${}_2$As${}_2$ and LiFeAs: Density Functional Calculations
• Pairing Symmetry in a Two-Orbital Exchange Coupling Model of Oxypnictides
• Microwave Penetration Depth and Quasiparticle Conductivity in PrFeAsO_1-y Single Crystals : Evidence for a Full-Gap Superconductor
• Evidence for nodal superconductivity in LaFePO
• Superconducting gap symmetry of Ba0.6K0.4Fe2As2 studied by angle-resolved photoemission spectroscopy
• NMR relaxation rate in superconducting pnictides: extended $s_{\pm }$ scenario
• Unconventional London penetration depth in Ba(Fe0.93Co0.07)2As2 single crystals
• Superfluid density of the $\pm$s-wave state for the iron-based superconductors
• Resonant impurity scattering in the $\pm$s-gap state of the Fe-based superconductors
• Model for the Magnetic Order and Pairing Channels in Fe Pnictide Superconductors
• Origin of Gap Anisotropy in Spin Fluctuation Models of the Fe-pnictides
• Lifting of nodes by disorder in extended-$s$ state superconductors: application to ferropnictides
• Pseudogap and Superconductivity in Iron-Based Layered Superconductor studied by Fluctuation-Exchange Approximation
• Evidence for Nodal Superconductivity in LaFePO from Scanning SQUID Susceptometry
• Interplay between magnetism and superconductivity in Fe-pnictides
• Properties of a two orbital model for oxypnictide superconductors: Magnetic order, B_2g spin-singlet pairing channel, and its nodal structure
• Valley density-wave and multiband superconductivity in Fe-pnictides
• Superfluid density and penetration depth in Fe-pnictides
• Quasiparticle Heat Transport in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$: Evidence for a k-dependent Superconducting Gap without Nodes
• Magnetic penetration depth of single crystal SmFeAsO_{1-x}F_y: a fully gapped superconducting state
• Renormalization group analysis of competing orders and the pairing symmetry in Fe-based superconductors
• Non-exponential London penetration depth in Ba${}_{1-}$K${}_x$Fe${}_2$As${}_2$ single crystals
• Orbital coupling and superconductivity in the iron pnictides
• Pairing in the iron arsenides: a functional RG treatment
• Magnetism and Superconductivity in the Two-Dimensional 16 Band d-p Model for Iron-Based Superconductors
• Band renormalization and Fermi surface reconstruction in iron-based superconductors
• On superconducting and magnetic properties of iron-oxypnictides
• Microwave response of superconducting pnictides: extended $s_{\pm }$ scenario

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