Macroscopic Aharonov-Bohm effect in type-I superconductorsC. 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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