Dynamic Scaling at the Zero-field 2D Superconducting Transition

Details Dynamic Scaling at the Zero-field 2D Superconducting Transition Dynamic Scaling at the Zero-field 2D Superconducting Transition

1997-11-13

arxiv.org/abs/cond-mat/9711127v2

Physics

Condensed Matter

Superconductivity

Minor revisions, 4 pages LaTeX, 3 .eps figs

Scientific paper

Zero-field current-voltage (I-V) characteristics of a thin ("two-dimensional") $Bi_2Sr_2CaCu_2O_{8+\delta}$ crystal are reported and analyzed in two ways. The "conventional" approach yields ambiguous results while a dynamical scaling analysis offers new insights into the Kosterlitz-Thouless-Berezinskii transition. The scaling theory predicts that the universal jump of the $I$-$V$ exponent $\alpha$ should be between $z+1$ and 1. A value of $z \simeq 5.6$ is obtained for the dynamical critical exponent, and is corroborated by data from other 2D superconductors. A simple dynamical model is presented to account for the results.

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