F. Tafuri, J.R. Kirtley, et al.
Low Temperature Physics
We have made zero-field current-voltage (IV) measurements of artificially layered high-Tc, thin-film bridges. SQUID microscopy of these films provides Pearl lengths A longer than the bridge widths, and shows current distributions that are uniform across the bridges. At high temperatures and high currents the voltages follow the power law V ∝ In, with n = Φ02/8π2ΛkT + 1, in good agreement with the predictions for thermally activated vortex motion. At low temperatures, the IV's are better fit by In V linear in I-2, as expected if the low-temperature dissipation is dominated by quantum tunneling of individual Pearl vortices. © EDP Sciences.
F. Tafuri, J.R. Kirtley, et al.
Low Temperature Physics
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Physical Review B
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Physical Review Letters
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Physical Review B - CMMP