Excess noise in dc SQUIDs from 4.2K to 0.022K
作者： F. Wellstood , C. Urbina , J. Clarke
DOI: 10.1109/TMAG.1987.1065021
关键词:
摘要: Four types of excess noise have been identified in dc SQUIDs operated the temperature range 0.022 to 4.2 K. At temperatures between about 2 and 4 K, spectral density low frequency flux a wide variety thin-film scales as 1/fmwhere m = 1.0 ± 0.1. In with Nb loops originates an "apparent noise", whereas those Pb or PbIn is substantially lower critical current fluctuations. When any these devices cooled below 0.5 1/fm, 0.66 0.08 most cases, always apparent noise. lowest temperatures, white saturates at effective 150 mK; this probably arises from self-heating resistance shunting each tunnel junction.
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