Abstract
The superconducting properties of Y{sub 1-y}Ca{sub y}Sr{sub 2}Cu{sub 2}GaO{sub 7-{delta}} have been examined and related to the Ca content, y, and the use of annealing treatments at 350 bar oxygen. Superconductivity with {Tc} up to 41 K was found only for high-pressure-annealed samples, and the structural effects of Ca substitution and high-pressure treatment were examined using powder neutron diffraction. Small but significant changes in Cu-Cu and Cu-O distances were found and suggest that the Cu ions are more highly charged in superconducting samples. Partial substitution of Ba for Sr was found to be possible (up to 20%) to give samples which, after annealing in high-pressure oxygen, were superconducting at temperatures up to 68 K.
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