Fluctuation Superconductivity in Mesoscopic Aluminum Rings

Details Fluctuation Superconductivity in Mesoscopic Aluminum Rings Fluctuation Superconductivity in Mesoscopic Aluminum Rings

2009-01-02

arxiv.org/abs/0901.0294v1

Science 318, 1440 (2007)

Physics

Condensed Matter

Superconductivity

Reprinted with permission from AAAS

Scientific paper

10.1126/science.1148758

Fluctuations are important near phase transitions, where they can be difficult to describe quantitatively. Superconductivity in mesoscopic rings is particularly intriguing because the critical temperature is an oscillatory function of magnetic field. There is an exact theory for thermal fluctuations in one-dimensional superconducting rings, which are therefore expected to be an excellent model system. We measure the susceptibility of many rings, one ring at a time, using a scanning SQUID that can isolate magnetic signals from seven orders of magnitude larger background applied flux. We find that the fluctuation theory describes the results and that a single parameter characterizes the ways in which the fluctuations are especially important at magnetic fields where the critical temperature is suppressed.

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