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The effects of Co substitution on structural and superconducting propertiesof RuSr2GdCu2O8 compound have been studied. Rietveld refinements of the X-raydiffraction patterns indicate that the cobalt ion progressively replacesruthenium sites. This replacement induces significant changes on the crystalstructure and on the magnetic and superconducting properties. The effects Cosubstitution on the superconducting behaviour, and more particulary on thechanges induce by the hole doping mechanism, were investigated in(Ru1-xCox)Sr2GdCu2O8 by a "bond valence sum" analysis with Co content from x=0.0 to x = 0.2. The weak ferromagnetic transition at Tm= 138.2 K is shifted tolower temperature, and suppressed at higher Co content. From thecrystallographic point of view the Ru-O(1)-Cu bond angle, associated to therotation of the RuO6 octahedra, around the c-axis remain essetially constantwhen Ru is substituted by Co. Furthermore, increasing Co content has the effectto increase the weak ferromagnetic moment, which may be interpreted as the mainresponsible for breaking the delicate balance between magnetic andsuperconducting ordering.Comment: 21 pages, 8 figure

superconductor science and technology/superconductor science and technology

Structural analysis, magnetic and transport properties of the (Ru1−xCox)Sr2GdCu2O8system