Abstract
The effects of Co substitution on the structural and superconducting properties of theRuSr2GdCu2O8 compound have been studied. Rietveld refinements of the x-ray diffraction patterns indicatethat the cobalt ion progressively replaces ruthenium sites. This replacement inducessignificant changes on the crystal structure and on the magnetic and superconductingproperties. The effects of Co substitution on the superconducting behaviour, and moreparticularly on the changes induced by the hole doping mechanism, were investigated in(Ru1−xCox)Sr2GdCu2O8 by a ‘bond valence sum’ analysis with Co content fromx = 0.0 to 0.2. The weak ferromagnetic transition atTM = 138.2 K is shifted to lower temperature, and suppressed at higher Co content. From thecrystallographic point of view the Ru–O(1)–Cu bond angle, associated to the rotation of theRuO6 octahedraaround the c-axis, remains essentially constant when Ru is substituted by Co. Furthermore, increasingCo content has the effect of increasing the weak ferromagnetic moment, which may beinterpreted as the main feature responsible for breaking the delicate balance betweenmagnetic and superconducting ordering.
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