Measurements of Nyquist Noise Spectra in Passive Electric Circuits by Using a SQUID

Abstract
The Nyquist noise power spectra of various electric circuits have been measured by using a SQUID. From these measurements, we have demonstrated the applicability of the observed noise spectra to noise thermometry. The results of the noise measurements, especially in bulk metal rods, might be useful for establishing noise-free conditions for SQUID measuring systems.

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