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The compound EuFe(2-x)Co(x)As2 was investigated by means of the 57Fe and151Eu Moessbauer spectroscopy versus temperature (4.2 - 300 K) for x=0(parent), x=0.34 - 0.39 (superconductor) and x=0.58 (overdoped). It was foundthat spin density wave (SDW) is suppressed by Co-substitution, however itsurvives in the region of superconductivity, but iron spectra exhibit somenon-magnetic component in the superconducting region. Europium ordersanti-ferromagnetically regardless of the Co concentration with the spinre-orientation from the a-axis in the parent compound toward c-axis with theincreasing replacement of iron by cobalt. The re-orientation takes place closeto the a-c plane. Some trivalent europium appears in EuFe(2-x)Co(x)As2 versussubstitution due to the chemical pressure induced by Co-atoms and itexperiences some transferred hyperfine field from Eu2+. Iron experiences sometransferred field due to the europium ordering for substituted samples in theSDW and non-magnetic state both, while the transferred field is undetectable inthe parent compound. Superconductivity coexists with the 4f-europium magneticorder within the same volume. It seems that superconductivity has somefilamentary character in EuFe(2-x)Co(x)As2 and it is confined to thenon-magnetic component seen by the iron Moessbauer spectroscopy.

Interplay between magnetism and superconductivity in EuFe(2-x)Co(x)As2 studied by 57Fe and 151Eu M\"{o}ssbauer spectroscopy