Gap structure in Fe-based superconductors with accidental nodes: The role of hybridization

Alberto Hinojosa, Andrey V. Chubukov

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6 Scopus citations

Abstract

We study the effects of hybridization between the two electron pockets in Fe-based superconductors with s-wave gap with accidental nodes. We argue that hybridization reconstructs the Fermi surfaces and also induces an additional interpocket pairing component. We analyze how these two effects modify the gap structure by tracing the position of the nodal points of the energy dispersions in the superconducting state. We find three possible outcomes. In the first, the nodes simply shift their positions in the Brillouin zone; in the second, the nodes merge and disappear, in which case the gap function has either equal or opposite signs on the electron pockets; in the third, a new set of nodal points emerges, doubling the original number of nodes.

Original languageEnglish (US)
Article number224502
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number22
DOIs
StatePublished - Jun 4 2015

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