Evidence for nonconventional vortex dynamics in an ideal two-dimensional superconductor
R. Théron, J.-B. Simond, Ch. Leemann, H. Beck, P. Martinoli, P. Minnhagen
DOI 10.1103/PhysRevLett.71.1246 · Physical Review Letters
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Abstract
Impedance measurements performed on a weakly frustrated triangular array of Josephson junctions over a wide range of frequencies and at temperatures such that vortex pinning is irrelevant reveal that vortex dynamics in an ideal two-dimensional (2D) superconductor does not obey Drude’s classical prediction for a 2D Coulomb gas of free and independent vortex charges. An analysis in terms of a complex vortex dielectric constant implies that the vortex mobility vanishes logarithmically in the limit of small frequencies, thereby pointing to anomalous vortex diffusion.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.7 | Pressure not reported | onset |
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