期刊
APPLIED PHYSICS LETTERS
卷 94, 期 4, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3074446
关键词
aluminium compounds; critical current density (superconductivity); fluctuations in superconductors; Josephson effect; niobium; type II superconductors
资金
- NSF [DMR-0325551]
We measured the low frequency critical current noise in Nb/AlOx/Nb Josephson junctions. Unshunted junctions biased above the gap voltage and resistively shunted junctions biased near the critical current I-c have been measured. For both, the spectral density of delta I-c/I-c, S-ic(f), is proportional to 1/f, scales inversely as the area A and is independent of J(c)equivalent to I-c/A over a factor of nearly 20 in J(c). For all devices measured at 4.2 K, S-ic(1 Hz)=2.0 +/- 0.4x10(-12)/Hz when scaled to A=1 mu m(2). We find that, from 4.2 to 0.46 K, S-ic(f) decreases linearly with temperature.
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