Abstract
The phenomenology of iron pnictide superconductors can be explained in the framework of a three-band s± wave Eliashberg theory with only two free parameters plus a feedback effect, i.e., the effect of the condensate on the antiferromagnetic spin fluctuations responsible for the superconductivity in these compounds. I have examined the experimental data of four materials, LaFeAsO1−xFx , SmFeAsO1−xFx, Ba1−xKxFe2As2, and Ba(FexCo1−x )2As2, and I have found that it is possible to reproduce the experimental critical temperature and gap values in a moderate strong-coupling regime, λtot ≈ 1.7 − 2.0
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