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Dynamic Scaling of Magnetic Flux Noise Near the KTB Transition in Overdamped Josephson Junction Arrays

T. J. Shaw·M. J. Ferrari·D. -H. Lee·John Clarke·L. L. Sohn·M. Tinkham
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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 $f f_ξ$. Here $f_ξ\proptoξ^{-z}$, where $ξ$ is the correlation length and $z$ is the dynamic exponent. Moreover, when all frequencies are scaled by $f_ξ$, data for different temperatures and frequencies collapse on to a single curve. In addition, we have extracted the dynamic exponent $z$ and found $z=1.98\pm0.03$.

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T. J. Shaw, M. J. Ferrari, D. -H. Lee, John Clarke, L. L. Sohn, M. Tinkham. 1996-03-10. Dynamic Scaling of Magnetic Flux Noise Near the KTB Transition in Overdamped Josephson Junction Arrays. https://doi.org/10.1103/physrevlett.76.2551

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