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 language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Jun 16 2011|