Abstract
Abstract The resistivity, Hall effect and thermoelectric power of the solid solution series Nd(Ba 1− x Nd x ) 2 Cu 3 O 7+δ , with x =0 to 0.25, have been studied. Although the average copper valence is nearly constant throughout the series, the transport properties show a strong dependence on x ranging from superconductivity with a T c of 95 K at x =0 to an activated conduction at x =0.25. These observations are explained within a model where, depending on x , there is a variable distribution of holes between the CuO 2 planes and other parts of the structure, most likely the CuO 3 chains.
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