Abstract
The temperature dependent thermoelectric power and resistivity for a series of disordered (Nd 0.8− x Pr 0.2Ca x )Ba 2Cu 3O 7− δ with 0⩽ x⩽0.20 has been measured in order to study the disorder effect induced by Pr-doping, in which 50% of the Pr ion is in the Pr(IV) state deduced from unit cell volumes. The hole concentration in CuO 2 planes ( p sh) of the samples has been estimated from the oxygen stoichiometry. T c-suppression by Pr-doping could not be recovered by increasing p sh, demonstrating that the ionic disorder effect plays an important role on Pr-doped samples.
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