Physics – Condensed Matter – Superconductivity
Scientific paper
2003-12-10
Physics
Condensed Matter
Superconductivity
6 pages, 5 figures; corrected typos/grammatical errors and made other minor changes to text; updated figures - changes are vis
Scientific paper
10.1103/PhysRevB.70.214506
A system of two coplanar superconducting films seamlessly connected by a bridge is studied. We observe two distinct resistive transitions as the temperature is reduced. The first one, occurring in the films, shows some properties of the Berezinskii-Kosterlitz-Thouless (BKT) transition. The second apparent transition (which is in fact a crossover) is related to freezing out of thermally activated phase slips (TAPS) localized on the bridge. We also propose a powerful indirect experimental method allowing an extraction of the sample's zero-bias resistance from high-current-bias measurements. Using direct and indirect measurements, we determined the resistance $R(T)$ of the bridges within a range of {\em eleven orders of magnitude}. Over such broad range, the resistance follows a simple relation $R(T)=R_N \text{exp} [-(c/t)(1-t)^{3/2}]$, where $c=\Delta F(0) / kT_c$ is the normalized free energy of a phase slip at zero temperature, $t=T/T_c$ is normalized temperature, and $R_N$ is the normal resistance of the bridge.
Bezryadin Alexey
Bollinger A. T.
Chu Sang L.
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