2003/12/19 by Petter Minnhagen, Beom Jun Kim, A. Gronlund
Physics and Astronomy · #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.69.064515
published as Phys. Rev. B 69, 064515 (2004) · 6 pages, to appear in PRB
arxiv created 2003/12/19 · arxiv updated 2009/12/01
It is shown from computer simulations that the current-voltage (I-V) characteristics for the two-dimensional XY model with resistively-shunted Josephson junction dynamics and Monte Carlo dynamics obeys a finite-size scaling form from which the nonlinear I-V exponent a can be determined to good precision. This determination supports the conclusion a=z+1, where z is the dynamic critical exponent. The results are discussed in the light of the contrary conclusion reached by Tang and Chen [Phys. Rev. B \bf 67, 024508 (2003)] and the possibility of a breakdown of scaling suggested by Bormann [Phys. Rev. Lett. \bf 78, 4324 (1997)].