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Iron-based superconductors Ba0.7Rb0.3Fe2As2 and CaFe1.92Co0.08As2 of the'122' family have been investigated by means of the 14.41-keV Moessbauertransition in 57Fe versus temperature ranging from the room temperature till4.2 K. A comparison is made with the previously investigated parent compoundsBaFe2As2 and CaFe2As2. It has been found that Moessbauer spectra of thesesuperconductors are composed of the magnetically split component due todevelopment of spin density wave (SDW) and non-magnetic component survivingeven at lowest temperatures. The latter component is responsible forsuperconductivity. Hence, the superconductivity occurs in the part of thesample despite the sample is single phase. This phenomenon is caused by theslight variation of the dopant concentration across the sample (crystal).

Interplay between spin density wave and superconductivity in '122' iron pnictides: 57Fe M\"ossbauer study