Abstract
The effects of Zn and Ni substitution are interesting because of the contrast in magnetic properties of these elements. In this study, GdBaSr(Cu 3− x M x )O 7− δ samples (M = Zn and Ni; 0 ⩽ x ⩽ 0.1) were prepared via solid-state reaction. Four point probes were used for resistance versus temperature measurement. Results show decrease in T c with increase of x contents for both dopants. This variation is assumed to be irrelevant to the different of phases or impurity effects since X-ray patterns show all samples are in tetragonal single-phase. Decrease of T c is related to the disruption of spin correlation of the CuO 2 planes. The doping only affects the T c without changes the transition width for both dopants. It was suggested that Zn and Ni substitution do not affect the magnitude of the spin gap in the ladder but change the number of spin-singlet pairs. However, Zn doping depresses the T c more obviously than Ni doping. It is suggested that Zn as a non-magnetic dopant might induce more unpaired hole carriers. Moreover, the effect of substitution site by both dopants will also be discussed.
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