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Iron-based superconductor SmFeAsO(0.91)F(0.09) has been investigated by the57Fe Moessbauer spectroscopy versus temperature with the special attention paidto the region of the superconducting transition at about 47 K. Modulation ofthe electron charge density was found. It leads to the development of thecharge density wave (CDW) and electric field gradient wave (EFGW). Themodulation of CDW is enhanced in the temperature region of the superconductinggap opening, while the amplitude of EFGW is partly suppressed within thistemperature region. This effect is exactly opposite to the similar effect inBa(0.6)K(0.4)Fe2As2 superconductor. Hence, it seems that d electrons contributesignificantly to the Cooper pair formation in both compounds as EFGW isperturbed within the temperature region of the superconducting gap formation.

Change of the charge modulation during superconducting transition in SmFeAsO(0.91)F(0.09) seen by 57Fe M\"ossbauer spectroscopy