Effect of the Anisotropy Field and Magnetic Ordering on the Electrical Properties of Substituted and Unsubstituted Nd2CuO4

Abstract

Nd 2Àx R x CuO 4 compounds (R Y and Fe and x 0X0 and 0.05) are prepared by the conventional ceramic method. The majority of charge carriers is found to be positive for Nd 2 CuO 4 and negative for substituted compounds. The electrical resistivity decreased with Y-substitution and decreased further with Fe-substitution. In Nd 2 CuO 4 , a localization region is observed and is attributed to both the presence of anisotropy field and effect of self-doping. The localization field has been depressed in substituted compounds. DSC charts confirmed that the different transitions affected greatly the electrical resistivity as well as the thermoelectric power. The oxygen content is found to affect the transition temperature T N for substituted compounds.