Low Frequency Resistance Fluctuations in Films of High Temperature Superconductors

摘要

Low frequency voltage fluctuations in thin films of YBa2 Cu3 O/7-x/ at and above the superconducting transition have a spectral density S/sub v/(f) proportional to /bar V/ sup 2 /f, where /bar V/ is the average voltage across the film and f is the frequency. The value of S/sub v/(f)//bar V/ sup 2 decreases markedly as the microstructure of the films is improved. In contrast to classic superconductors, the noise at the resistive transition does not arise from equilibrium temperature fluctuations. 9 refs., 4 figs. (ERA citation 14:019995)