Abstract
The four cuprate layer superconductor Tl 2Ba 2Ca 3Cu 4O 12 has been synthesised with Sr partially replacing Ba giving samples of stoichiometry Tl 1.5(Ba 2−xSr x)Ca 3.5Cu 4O 12 for x up to 0.3. X-ray diffraction data show single superconducting phase materials with significant reductions in the c-lattice parameter for increasing Sr content. The spacing between the central Cu1-Cu1 planes is observed to decrease whilst the outer Cu1–Cu1 distance increases with higher Sr contents. These variations in the cuprate layer spacings and proximity of the thallium oxygen planes to the copper layers, which occur as a function of changing Sr content, have been correlated with the superconducting properties. Values of T c remained almost constant around 115 K, however, the susceptibility increased with increasing Sr levels.
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