Low-frequency noise in dc superconducting quantum interference devices below 1 K

Wellstood, Frederick C.; Urbina, Cristian; Clarke, John
March 1987
Applied Physics Letters;3/23/1987, Vol. 50 Issue 12, p772
Academic Journal
At temperatures below about 1 K, a series of dc superconducting quantum interference devices (SQUID’s) exhibited an apparent flux noise with a spectral density scaling as 1/f α, where 0.58<α<0.80. Typically, the magnitude of the noise increased as the temperature was lowered below 1 K, tending to flatten out at low temperatures with a value of 7±3 μ[uppercase_phi_synonym]0Hz-1/2 at 1 Hz that was nearly independent of the parameters and materials of the SQUID’s. Although a large number of hypothetical sources of the noise have been eliminated, the origin remains unidentified.


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