Effect of the anisotropy field and magnetic ordering on the electrical properties of substituted and unsubstituted Nd2CuO4

Nd2-xRxCuO4 compounds (R = Y and Fe and x = 0.0 and 0.05) are prepared by t he conventional ceramic method. The majority of charge carriers is found to be positive for Nd2CuO4 and negative for substituted compounds. The electr ical resistivity decreased with Y-substitution and decreased further with F e-substitution. In Nd2CuO4, a localization region is observed and is attrib uted to both the presence of anisotropy field and effect of self-doping. Th e localization field has been depressed in substituted compounds. DSC chart s confirmed that the different transitions affected greatly the electrical resistivity as well as the thermoelectric power. The oxygen content is foun d to affect the transition temperature T-N for substituted compounds.