Relation between nodes and 2Δ/Tc on the hole Fermi surface in iron-based superconductors

Saurabh Maiti, Andrey V. Chubukov

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6 Scopus citations

Abstract

We analyze the interplay between the absence or presence of nodes in the superconducting gap along electron Fermi surfaces (FSs) in Fe pnictides and 2Δ/Tc along hole FSs (2Δh/Tc), measured by angle-resolved photoemission spectroscopy (ARPES). We solve the set of coupled gap equations for 4- and 5-pocket models of Fe pnictides and relate the presence of the nodes to 2Δh/Tc being below a certain threshold. Using ARPES data for 2Δh/Tc, we find that the optimally doped Ba1-xKxFe2As 2 and Ba(Fe1-xCox)2As2 are likely nodeless, but isovalent BaFe2(As1-xP x)2 likely has nodes.

Original languageEnglish (US)
Article number220508
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number22
DOIs
StatePublished - Jun 16 2011
Externally publishedYes

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