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We report on the combined experimental and theoretical analysis of themicrowave-frequency electromagnetic response of BaFe2As2 single crystals withdifferent substitutions: K in the Ba site (hole doping), Co in the Fe site(electron doping), and P in the As site (isovalent substitution). Measurementsusing a coplanar resonator technique lead to the experimental determination ofthe penetration depth and microwave conductivity as a function of temperature.The whole set of data is analyzed within a self-consistent three-band$s_{\pm}$-wave Eliashberg approach, able to account for all the main observedfeatures in the different properties. Besides the validation of the modelitself, the comparison between experiment and theory allows discussing thepossible role of the Fe-As planes in defining the superconducting properties ofthese compounds, the relevance of coherence effects, and the presence of nodesin the superconducting order parameter.

Comprehensive Eliashberg analysis of microwave conductivity and penetration depth of K-, Co-, and P-substituted BaFe2As2