Physics – Condensed Matter – Superconductivity
Scientific paper
2005-04-06
Physics
Condensed Matter
Superconductivity
5 pages, 7 figs
Scientific paper
10.1209/epl/i2005-10485-3
We have made current-voltage (IV) measurements of artificially layered high-$T_c$ thin-film bridges. Scanning SQUID microscopy of these films provides values for the Pearl lengths $\Lambda$ that exceed the bridge width, and shows that the current distributions are uniform across the bridges. At high temperatures and high currents the voltages follow the power law $V \propto I^n$, with $n=\Phi_0^2/8\pi^2\Lambda k_B T+1$, and at high temperatures and low-currents the resistance is exponential in temperature, in good agreement with the predictions for thermally activated vortex motion. At low temperatures, the IV's are better fit by $\ln V$ linear in $I^{-2}$. This is expected if the low temperature dissipation is dominated by quantum tunneling of Pearl vortices.
Balestrino G.
Born Detlef
Kirtley John. R.
Kogan Vladimir G.
Medaglia P. G.
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