Superconducting material and a method for preparing the same

This patent describes a superconducting material comprising a compound oxide represented by the formula: (Ba, Ca)x(α,Dy)1-xTlyCu1-yO3-zwhere the atomic ratio of Ca to Ba is selected to be about 10%. α represents Y or La, the atomic ratio of Dy to α is selected to be about 30%, x, y and z are numbers wherein x is selected to be about 0.66, y is selected to be about 0.11, and z is selected to be in the range 0≤z≤1, and the expression (Ba, Ca) and (α, Dy) mean that the respective elements position predetermined sites in a crystal in a predetermined proportion