Abstract
A series of new superconductors Sr2−xBaxCuO3+δ (x⩽0.6) were prepared under high pressure high temperature. The superconductors crystallize into K2NiF4-type structure of I4/mmm space group similar to the classical La2CuO4 but with partially occupied apical oxygen. It is found that Tc of this barium doped Sr2CuO3+δ superconductor is associated with the ratio of A-site cation substitution while keeping at optimal carrier doping level. The superconducting transition temperature with Tcmax=98K which represents the record high Tc in the single-layer copper oxide superconductors was achieved in this material.
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