Ab-initio theory of Iron based superconductors
  We report the first-principles study of superconducting critical temperature and superconducting properties of Fe-based superconductors taking into account on the same footing phonon, charge and spin-fluctuation mediated Cooper pairing. We show that in FeSe this leads to a modulated s$\pm$ gap symmetry, and that the antiferromagnetic paramagnons are the leading mechanism for superconductivity in FeSe, overcoming the strong repulsive effect of both phonons and charge pairing. 
F. Essenberger, A. Sanna, P. Buczek, A. Ernst, L. Sandratskii, E.K.U.   Gross
cond-mat.supr-con