Abstract
The superconducting properties of single phase La1·5−x Ca x+y Ba1·5−y Cu3O z , 0·0≤x≤0·60 (LC) and 0·0≤y≤0·70 (CB), compounds with tetragonal triple-perovskite structure are studied, using X-ray diffraction for their resistivity, a.c. susceptibility, and oxygen-content. La1·5−x Ca x Ba1·5Cu3O z (LC) samples, 0·15≤x≤0·60, are superconducting withT R=0c between 40 and 74 K. With the increase inx, the oxygen content, hole concentration in the CuO2 layers as well as theT c increase. It is interesting to find that although the hole concentration and oxygen stoichiometry of the LaCa0·5+y Ba1·5−y Cu3O z (CB) compounds increase with the increase iny, theT R=0c remains nearly constant around 74 K fory=0·0−0·70. A correlation exists between theT c and the hole concentration for LC and CB compounds.
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