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Phase diagram of iron-pnictides if doping acts as a disorder

We obtain and analyze the phase diagram of doped iron-pnictides under the assumption that doping adds non-magnetic impurities to the system but does not change the densities of carriers. We show that the phase diagram is quite similar to the one obtained under the opposite rigid band assumption. In both cases, there is a phase where extended s+- superconductivity and antiferromagnetism co-exist. We evaluate the jump of the specific heat at the superconducting transition across the phase diagram and show that the jump is non-monotonic, with the maximum at the onset of the co-existence phase. Our results are in quantitative agreement with experiments on some iron-pnictides.