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VOLUME 68 (1998) | ISSUE 4 | PAGE 291
Flux noise near the Berezinskii-Kosterlitz-Thouless transition
PACS: 74.40.+k, 74.50.+r
We study the flux noise in Josephson junction arrays in the critical regime above the Berezinskii-Kosterlitz-Thouless transition. In proximity coupled arrays a local ohmic damping for the phases is relevant, giving rise to anomalous vortex diffusion and a dynamic scaling of the flux noise in the critical region. It shows a crossover from white to l//-noise at a frequency ωξ ос ξ~ζ with a dynamic exponent ζ = 2.