Low frequency resistance fluctuations in films of high temperature superconductors

Low-frequency voltage fluctuations in thin films of YBa/sub 2/Cu/sub 3/O/sub 7-x/ at and above the superconducting transition temperature have a spectral density proportional to the ratio of the average voltage across the film to the frequency. The ratio of the spectral density to the average voltag...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1989-03, Vol.25 (2), p.973-975
Main Authors: Rosenthal, P., Hammond, R.H., Beasley, M.R., Leoni, R., Lerch, P., Clarke, J.
Format: Article
Language:English
Subjects:
Fluctuations
Frequency
High temperature superconductors
Low-frequency noise
Magnetic noise
SQUIDs
Superconducting device noise
Superconducting films
Superconducting materials
Superconducting transition temperature
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Summary:Low-frequency voltage fluctuations in thin films of YBa/sub 2/Cu/sub 3/O/sub 7-x/ at and above the superconducting transition temperature have a spectral density proportional to the ratio of the average voltage across the film to the frequency. The ratio of the spectral density to the average voltage 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.< >
ISSN:0018-9464
1941-0069
DOI:10.1109/20.92451