Abstract
We describe transport properties at low temperatures and in high magnetic fields of thin films of Nd 1.85Ce 0.15CuO 4−δ, prepared by the process of laser ablation. Above T c, which is close to 20 K, the effects of superconducting conductance fluctuations are revealed by a positive magnetoresistance. The form of the fluctuations is fitted to the Aslamazov-Larkin and Maki-Thompson expressions in two dimensions. Below T c, in fields above the upper critical field H c2, fluctuations are also observed and are used to extract the position of H c2 in the broad and featureless resistive transition. In contrast to critical field curves obtained by a constant R/R n criterion, the temperature dependence extracted by this method follows the conventional Werthamer-Helfand-Hohenberg theory, except close to T c.
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