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

Saurabh Maiti; Andrey V. Chubukov

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

Superconductivity 2015-03-19 v1 Strongly Correlated Electrons

Authors: Saurabh Maiti , Andrey V. Chubukov

Abstract

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.

Keywords

iron-based superconductor superconductivity

Cite

@article{arxiv.1104.2923,
  title  = {Relation between 2Delta/Tc and nodes in Fe-based superconductors},
  author = {Saurabh Maiti and Andrey V. Chubukov},
  journal= {arXiv preprint arXiv:1104.2923},
  year   = {2015}
}

Comments

4pp, 2 figures, submitted to PRB

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