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Normal persistent currents in proximity-effect bilayers
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DOI：10.1103/PhysRevB.84.184519.png)
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Abstract
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We calculate the contribution of superconducting fluctuations to the mesoscopic persistent current of an ensemble of rings, each made of a superconducting layer in contact with a normal one, in the Cooper limit. The superconducting transition temperature of the bilayer decays very quickly with the increase of the relative width of the normal layer. In contrast, when the Thouless energy is larger than the temperature, then the suppression of the persistent current with the increase of this relative width is much slower than that of the transition temperature. This effect is similar to that predicted for magnetic impurities, although the proximity effect considered here results in pair weakening as opposed to pair breaking.
Keywords:
NORMAL-METAL RINGS
MESOSCOPIC RINGS
ORDER-PARAMETER
SUPERCONDUCTORS
FLUCTUATIONS
SINGLE
LOOP
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