Abstract
Studies in superconducting properties of NbN–SiO2 films are reported. The films were obtained through nitridation of sol–gel derived Nb2O5–SiO2 coatings at 1200°C, a process leading to the formation of disordered structures with NbN metallic grains dispersed in the insulating SiO2 matrix. Electrical resistivity was measured with the conventional four-terminal method in the temperature range from 5 to 280K. The samples’ superconducting properties, examined with magnetically modulated microwave absorption (MMMA), depend on the NbN/SiO2 molar ratio and the film’s thickness.
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