Abstract
The effect of transition-metal impurities on the superconducting properties of Y1Ba2Cu3O7-x was studied and the transition temperature was found to be sensitive to the orthorhombic-tetragonal phase transition, which in turn depends on a number of elemental properties including the oxidation state. Thermodynamic calculations show that dopants with high oxidation states have the same effect as oxygen partial pressure in stabilising the superconducting orthorhombic phase. This effect is consistent with experimental results.
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