Superconductivity in ABa2Cu3O7-x compounds, where A=(R1)x(R2)1-x and R1, R2=Y, Sm, Eu, Gd, Tb, Dy, Yb, Zr and Nb

The electrical resistance has been measured for a series of compounds ABa2Cu3O7-x where A=(R1)x(R2)1-x and R1, R2=Y, Sm, Eu, Gd, Tb, Dy, Yb, Zr and Nb. All the compounds show superconductivity at about 90 K. A magnetisation measurement has been made at 77 K as a function of magnetic field.

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