Physics – Condensed Matter – Superconductivity
Scientific paper
2008-03-21
Appl. Phys. Lett. v92, 102502(2008), also selected for the March 15, 2008 issue of Virtual Journal of Applications of Supercon
Physics
Condensed Matter
Superconductivity
One pdf file, 4 pages, 4 figure. For figure 1, a smaller file is uploaded
Scientific paper
10.1063/1.2894515
We have measured the magnetoresistance of a dc superconducting quantum interference device in the form of an interrupted mesoscopic normal-metal loop in contact with two superconducting electrodes. Below the transition temperature of the superconducting electrodes, large $h/2e$ periodic magnetoresistance oscillations are observed. By adding a small dc bias to the ac measurement current, $h/4e$ oscillations can be produced. Lowering the temperature further leads to even larger oscillations, and eventually to sharp switching from the superconducting state to the normal state. This flux-dependent resistance could be utilized to make highly sensitive flux detector.
Cadden-Zimansky Paul
Chandrasekhar Venkat
Wei Jian
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