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Anomalous finite-size effect in superconducting Josephson junction arrays

Qing-Hu Chen, Lei-Han Tang, Peiqing Tong

cond-mat.stat-mecharXiv:cond-mat/0104392

Abstract

We report large-scale simulations of the resistively-shunted Josephson junction array in strip geometry. As the strip width increases, the voltage first decreases following the dynamic scaling ansatz proposed by Minnhagen et al. [Phys. Rev. Lett. 74, 3672 (1995)], and then rises towards the asymptotic value predicted by Ambegaokar et al. [Phys. Rev. Lett. 40, 783 (1978)]. The nonmonotonic size-dependence is attributed to shortened life time of free vortices in narrow strips, and points to the danger of single-scale analysis applied to a charge-neutral superfluid state.

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