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

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

2009-03-31

arxiv.org/abs/0903.5547v1

Phys. Rev. B 80, 140515(R) (2009)

Physics

Condensed Matter

Superconductivity

5pp, 3 figures

Scientific paper

10.1103/PhysRevB.80.140515

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.

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