Dynamic Scaling of Magnetic Flux Noise near the Kosterlitz-Thouless-Berezinskii Transition in Overdamped Josephson Junction Arrays
T. J. Shaw, M. J. Ferrari, L. L. Sohn, D.-H. Lee, M. Tinkham, John Clarke
DOI 10.1103/PhysRevLett.76.2551 · Physical Review Letters
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Abstract
We have used a dc superconducting quantum interference device to measure the magnetic flux noise generated by the equilibrium vortex density fluctuations associated with the Kosterlitz-Thouless-Berezinskii (KTB) transition in an overdamped Josephson junction array. At temperatures slightly above the KTB transition temperature, the noise is white for f<fξ and scales as 1/f for f>fξ. Here fξ∝ξ−z, where ξ is the correlation length and z is the dynamic exponent. Moreover, when all frequencies are scaled by fξ, data for different temperatures and frequencies collapse onto a single curve.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure not reported | onset |
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