Abstract
The structure and superconductivity of Tl 0.5Pb 0.5Sr 2CuO y were studied by controlling the oxygen content or partially substituting lanthanide ions for Sr(II). The crystal structure greatly changed with the oxygen content. The samples with nearly full oxygen content ( y∼5.0) had tetragonal symmetry, while those with the lowest oxygen content ( y∼4.3) showed orthrhombic symmetry. The c-dimension increased for y>4.8 and then decreased with decreasing oxygen content, while the a-dimension was almost independent of composition. On the other hand, in the case of lanthanide substitution, the a- and c-dimensions were increased and decreased respectively with increasing lanthanide content. Superconductivity appeared with the substitution of a small amount of lanthanide ions for Sr(II), but was never achieved by controlling the oxygen content.
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