Relation between 2Delta/Tc and nodes in Fe-based superconductors

Details Relation between 2Delta/Tc and nodes in Fe-based superconductors Relation between 2Delta/Tc and nodes in Fe-based superconductors

2011-04-14

arxiv.org/abs/1104.2923v1

Physics

Condensed Matter

Superconductivity

4pp, 2 figures, submitted to PRB

Scientific paper

We analyze the interplay between the absence or presence of the nodes in the superconducting gap along electron Fermi surfaces (FSs) in Fe-pnictides, and 2Delta/T_c along hole FSs, measured by ARPES. We solve the set of coupled gap equations for 4-band and 5-band models of Fe-pnictides and relate the presence of the nodes to 2\Delta/T_c being below a certain threshold. Using ARPES data for 2\Delta/T_c, we find that optimally doped (BaK)Fe_2As_2 and Ba(FeCo)_2As_2 and likely nodeless, but iso-valent BaFe_2(AsP)_2 likely has nodes.

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