Evolution of superconductivity in Fe-based systems with doping

Andrey Chubukov

 We study the symmetry and the structure of the gap in Fe-based superconductors. by decomposing the pairing interaction obtained in the RPA into s- and d-wave components and into contributions from scattering between different Fermi surfaces. We show that each interaction is well approximated by the lowest angular harmonics and use this simplification to analyze the origin of the attraction in s- and d-wave channels, the competition between the two channels, and the origin of superconductivity in heavily doped systems, when only electron or only hole pockets are present.