Magnetism in SQUIDs at Millikelvin Temperatures

Details Magnetism in SQUIDs at Millikelvin Temperatures Magnetism in SQUIDs at Millikelvin Temperatures

2008-02-11

arxiv.org/abs/0802.1518v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.100.227006

We have characterized the temperature dependence of the flux threading dc SQUIDs cooled to millikelvin temperatures. The flux increases as 1/T as temperature is lowered; moreover, the flux change is proportional to the density of trapped vortices. The data is compatible with the thermal polarization of surface spins in the trapped fields of the vortices. In the absence of trapped flux, we observe evidence of spin-glass freezing at low temperature. These results suggest an explanation for the "universal" 1/f flux noise in SQUIDs and superconducting qubits.

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