Calculations for Magnetism in SQUIDs at Millikelvin Temperatures
نویسندگان
چکیده
S. Sendelbach, D. Hover, A. Kittel, M. Mück, John M. Martinis, and R. McDermott1,∗ Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA Institut für Physik, Carl von Ossietzky Universität, D-26111 Oldenburg, Germany Institut für Angewandte Physik, Justus-Leibig-Universität Gießen, D-35392 Gießen, Germany and Department of Physics, University of California, Santa Barbara, California 93106, USA (Dated: February 12, 2008)
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Magnetism in SQUIDs at millikelvin temperatures.
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 are compatible with the thermal polarization of surface spins in the trapped fields of the vortices. In the absence of trapped flux, we obse...
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