Abstract
We have tried to explore the possible sources of suppression of superconducting properties in cobalt substituted Cu0.5Tl0.5Ba2Ca2Cu3−x Co x O10−δ (x=0,0.05,0.1,0.5) superconductor. It can be expected from these studies that Co substitution at Cu sites in the CuO2 planes somehow localizes the carriers and decreases the mobile carriers density. The density of mobile carriers in the CuO2 planes can be restored by partial substitution of Li at Tl sites in Cu0.5Tl0.5Ba2O4−δ charge reservoir layer of Cu0.5Tl0.5Ba2Ca2Cu3−x Co x O10−δ superconductor; since alkali metals are known to lose their outermost “s-orbital” electron easily, which can be supplied to the CuO2 planes. The post-annealing experiments on these samples have been carried out in flowing oxygen and nitrogen and the motivation behind these extreme post-annealing conditions was to optimize the carriers density in the CuO2 planes of Cu0.5Tl0.5Ba2Ca2Cu3−x Co x O10−δ superconductor. The optimized free carrier density in the CuO2 planes enhances the superconducting properties of the final compound.
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