Physics – Condensed Matter – Superconductivity
Scientific paper
2005-11-04
Physics
Condensed Matter
Superconductivity
10 pages, 5 figures, submitted to PRL
Scientific paper
Electron transport and tunneling across the superconductor-insulator (SI) transition have been measured simultaneously for quench-condensed ultrathin amorphous beryllium films. The anomalous negative magnetoresistance previously observed in insulating films disappears when Mn impurities are introduced to the films, restoring a rather clean Efros-Shklovskii type hopping behavior. The combination of transport and tunneling data allows us to determine, independently and up to a constant on the order of unity, the localization length, \xi_{L}, and the dielectric constant, \kappa, for the films. As the normal-state sheet resistance of the films at 20 K is reduced with increasing film thickness, \xi_{L} increases exponentially. The SI transition occurs when \xi_{L} crosses the Ginzburg-Landau coherence length, \xi_{S}.
Bielejec E.
Wu Wenhao
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