Abstract
The superconducting transition of Nd 1.85Ce 0.15Cu 1+δO y samples was studied as a function of the Cu content and processing temperature through magnetic modulated microwave absorption and dc magnetization measurements. Differential thermal analysis and scanning electron microscopy observations show an indication of a small Cu nonstoichiometry with a maximum Cu excess in the T' structure, δ max ≲ 0.01. Superconducting transitions were observed only for samples with a Cu content 1+ δ ≥ 1.01. This Cu excess seems to be necessary in order to obtain superconductivity in the Nd-Ce-Cu-O system.
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