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Ru{1-x}Sn{x}Sr2EuCu2O8 and Ru{1-x}Sn{x}Sr2GdCu2O8 have been comprehensivelystudied by microwave and dc resistivity and magnetoresistivity and by the dcHall measurements. The magnetic ordering temperature T_m is considerablyreduced with increasing Sn content. However, doping with Sn leads to onlyslight reduction of the superconducting critical temperature T_c accompaniedwith the increase of the upper critical field B_c2, indicating an increaseddisorder in the system and a reduced scattering length of the conducting holesin CuO2 layers. In spite of the increased scattering rate, the normal stateresistivity and the Hall resistivity are reduced with respect to the purecompound, due to the increased number of itinerant holes in CuO2 layers, whichrepresent the main conductivity channel. Most of the electrons in RuO2 layersare presumably localized, but the observed negative magnetoresistance and theextraordinary Hall effect lead to the conclusion that there exists a smallnumber of itinerant electrons in RuO$_2$ layers that exhibit colossalmagnetoresistance.

Transport, magnetic and superconducting properties of RuSr2RCu2O8 (R= Eu, Gd) doped with Sn