The 1/f noise spectra of current-biased tin films on glass substrates at the superconducting transition were in quantitative agreement with the semiempirical formula of Clarke and Voss. Tin films with an aluminum underlay to reduce the thermal boundary resistance between film and substrate had spectra that were flat at low frequencies. Spatial correlation of the noise was observed in both types of samples.
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Clarke et al. (1975) studied this question.
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