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|
Macroscopic Aharonov-Bohm effect in type-I superconductors
Fachbereich Physik, Philipps-Universität Marburg - D-35032 Marburg, Germany
Accepted: 1 December 2004
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.
PACS: 73.23.-b – Electronic transport in mesoscopic systems / 74.25.Sv – Critical currents / 74.25.Op – Mixed states, critical fields, and surface sheaths
© EDP Sciences, 2005
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