Abstract
An improvement of the reduction process through the presence of an extra copper pellet together with the Nd2−xCexCuO4 sample in an evacuated quartz tube is presented. Using this reduction technique, we have found that samples of Nd1.85Ce0.15Cu1−yO4−δ with copper deficiency y=0.02 superconduct with TC=23K and the Meissner fraction is about 30%. X-ray diffraction (XRD) and energy dispersion X-ray analysis (EDAX) were used to characterize the surface of the samples. By means of DC magnetic measurement we have shown how deficiency and excess (2%) of copper in Nd1.85Ce0.15Cu1±yO4−δ influence the superconducting properties. At the end we compare the superconducting transition temperature of the samples treated in both the standard and modified reduction process.
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