Abstract
In order to discover the effects of oxygen ordering and carrier concentration on YBCO superconductivity, Zn- and Fe-doped systems were investigated as a function of dopant concentration and of oxygen stoichiometry, and with respect to resistive characteristics, bulk symmetry and oxygen microdomain ordering. The pair-breaking imputable to Zn substitution was found to be very effective on Tc, but not related to any structural modification or oxygen stoichiometry reduction. On the contrary, the Fe induced effects were observably perturbing the oxygen ordering and consequently reducing Tc. The analysis of the Tc versus oxygen stoichiometry plots relevant to the doped compounds suggests that different mechanisms drive the Tc reduction, depending on the site of substitution: electronic pair-breaking is dominant in Cu2 substituted systems (like Zn-doped YBCO) at the CuO2 conduction planes, while carrier concentration reduction is more effective in CuO substitution cases (like the Fe-doped one), where doping occurs at the CuO reservoir layers.
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