Description
I discuss the influence on spin-fluctuation pairing theory of
orbital selective strong correlation effects in Fe-based
superconductors, particularly Fe chalcogenide systems. This
approach provides a crude way to incorporate the reduced
coherence of quasiparticle occupying specific orbital states via
suppression of pair scattering processes involving those less
coherent states. I show that this paradigm yields remarkably
good agreement with the experimentally observed anisotropic
gap structures in both bulk and monolayer FeSe, as well as
LiFeAs, indicating that orbital selective Cooper pairing plays a
key role in the more strongly correlated iron-based
superconductors.
