Abstract
The elements (M = Li, Na, K) of group I-A of the periodic table having lower electronegativity as compared to that of Tl have been partially doped at Tl sites in the (Cu0.5Tl0.25M0.25)Ba2O4−δ charge reservoir layer of (Cu0.5Tl0.25M0.25)Ba2Ca2Cu3O10−δ superconductor. The objective was to investigate the role of electron–phonon interactions and mobile charge carriers in the oxide high temperature superconductors. It has been observed from these studies that the superconductivity parameters were improved after the doping of lower electronegative elements in the charge reservoir layer. The substitution of lower electronegative elements retains smaller amount of oxygen in (Cu0.5Tl0.25M0.25)Ba2O4−δ charge reservoir layer, which in turn facilitates the transfer of mobile charge carriers to the conducting CuO2 planes.
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