✍ Scribed by Y. Liu; H. Wang; Yu. Zadorozhny; M.M. Rosario; B.Y. Rock; N.A. Kurz; P.T. Carrigan
No coin nor oath required. For personal study only.
In this review we summarize our work on the destructive regime, the loss of superconductivity near half-flux quanta, and present new data on the possible observation of vortex-antivortex unbinding in ultrathin, doubly connected superconducting cylinders. These cylinders were prepared by evaporating a superconducting film onto a rotating quartz filament with a diameter as small as 100 nm, which is comparable with or smaller than the zero-temperature superconducting coherence length, nð0Þ. For cylinders with a relatively large diameter, bound vortex-antivortex pairs induced by thermal fluctuation and the loss of superconductivity through the unbinding of these pairs above a critical temperature are expected. However, when the diameter of the cylinder becomes smaller than nð0Þ, superconductivity is lost near the half-flux quanta even in the zero-temperature limit. We argue that this unique quasi one-dimensional system provides a link between one-and two-dimensional superconductors.
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