SOP TRANSACTIONS ON THEORETICAL PHYSICS Generalized Multiple Gap Model For The Superconductivity In Fe-As Based

Generalized multiple gap model for the Fe- As based oxygen containing superconductors is developed using the Greens function technique and equation of motion method. Self consistent equations for superconducting order parameters (D̄p, D̄d), specific heat Ces and density of states are derived. The theory is applied to explain the experimental results in oxygen containing Fe-As superconductors Sm0.95La0.05O0.85F0.15FeAs and SmO1x Fx FeAs. Comparison to experimental data is given where these are available. The agreement between theory and experiments is quite encouraging. The theory is also applicable to MgB2 superconductor. Keywords