Phys. Rev. Lett. 100, 227005 (2008) [4 pages]Microscopic Origin of Low-Frequency Flux Noise in Josephson CircuitsReceived 17 December 2007; published 5 June 2008 We analyze the data and discuss their implications for the microscopic origin of the low-frequency flux noise in superconducting circuits. We argue that this noise is produced by spins at superconductor insulator boundary whose dynamics is due to RKKY interaction. We show that this mechanism explains size independence of the noise, different frequency dependences of the spectra reported in large and small SQUIDs, and gives the correct intensity for realistic parameters. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.227005
DOI:
10.1103/PhysRevLett.100.227005
PACS:
85.25.Cp, 03.65.Yz, 73.23.−b
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