ANOMALOUS TRANSPORT-PROPERTIES IN SUPERCONDUCTING ND1.85CE0.15CUO4+ -DELTA/

We report a comprehensive study of the in-plane transport properties o f Nd2-xCeCuO4+/-delta epitaxial thin films and crystals by both increa sing and decreasing delta with Ce content fixed at x almost-equal-to 0 .15. We find a remarkable correlation between the appearance of superc onductivity and (1) a positive magnetoresistance in the normal state, (2) a positive contribution to the otherwise negative Hall coefficient , and (3) an anomalously large Nernst effect. These results strongly s uggest that both holes and electrons participate in the charge transpo rt for the superconducting phase of Nd2-xCexCuO4+/-delta.