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Science 14 December 2001:
Vol. 294. no. 5550, pp. 2332 - 2334
DOI: 10.1126/science.1066144
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Reports

Destruction of the Global Phase Coherence in Ultrathin, Doubly Connected Superconducting Cylinders

Y. Liu,* Yu. Zadorozhny, M. M. Rosario, B. Y. Rock, P. T. Carrigan, H. Wang

In doubly connected superconductors, such as hollow cylinders, the fluxoid is known to be quantized, allowing the superfluid velocity to be controlled by an applied magnetic flux and the sample size. The sample-size-induced increase in superfluid velocity has been predicted to lead to the destruction of superconductivity around half-integer flux quanta. We report transport measurements in ultrathin Al and Au0.7In0.3 cylinders verifying the presence of this destructive regime characterized by the loss of the global phase coherence and reveal a phase diagram featuring disconnected phase coherent regions, as opposed to the single region seen in larger superconducting cylinders studied previously.

Department of Physics, The Pennsylvania State University, University Park, PA 16802, USA.
*   To whom correspondence should be addressed. E-mail: liu{at}phys.psu.edu

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Fluctuation Superconductivity in Mesoscopic Aluminum Rings.
N. C. Koshnick, H. Bluhm, M. E. Huber, and K. A. Moler (2007)
Science 318, 1440-1443
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