Europhys. Lett.
Volume 69, Number 3, February 2005
Page(s) 431 - 434
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 12 January 2005
Europhys. Lett., 69 (3), pp. 431-434 (2005)
DOI: 10.1209/epl/i2004-10369-0

Macroscopic Aharonov-Bohm effect in type-I superconductors

C. Ellenberger, F. Gebhard and W. Bestgen

Fachbereich Physik, Philipps-Universität Marburg - D-35032 Marburg, Germany

received 7 October 2004; accepted 1 December 2004
published online 12 January 2005

In type-I superconducting cylinders, bulk superconductivity is destroyed above the first critical current. Below the second critical current the "type-I mixed state" displays fluctuation superconductivity which contributes to the total current. A magnetic flux on the axis of the cylinder can change the second critical current by as much as 50 percent, so that half a flux quantum can switch the cylinder from normal conduction to superconductivity: the Aharonov-Bohm effect manifests itself in macroscopically large resistance changes of the cylinder.

73.23.-b - Electronic transport in mesoscopic systems.
74.25.Sv - Critical currents.
74.25.Op - Mixed states, critical fields, and surface sheaths.

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