Theoretical investigation of electronic specific heat of two-band   superconductors
  We apply the generalized two-band model of superconductivity to calculate the electronic contribution to the specific heat, superconducting gaps and electron-boson coupling constants of the multi-band layered superconductors MgB2 and Ba(Fe0.925Co0.075)2As2. For both compounds, the obtained temperature-behavior of the specific heat well describes the experimental data. We compare our findings with the "two-band - model" that is frequently used to calculate the electronic specific heat, and that is applicable only for superconductors with strong interband scattering ("dirty" enough superconductors). 
E.G.Maksimov, A.E.Karakozov, B.P.Gorshunov, E.S.Zhukova, Ya. G.   Ponomarev, M.Dressel
cond-mat.supr-con