Zero-temperature resistive transition in Josephson-junction arrays at irrational frustration
Abstract Book of the XXIII IUPAP International Conference on Statistical Physics, Genova, Italy, (9-13 July 2007)Abstract
We use a driven Monte Carlo dynamics in the phase representation
to determine the linear resistivity and current-voltage scaling of
a two-dimensional Josephson-junction array at an irrational flux
quantum per plaquette. The results are consistent with a
phase-coherence transition scenario where the critical temperature
vanishes. The linear resistivity is nonzero at any finite
temperatures but nonlinear behavior sets in at a
temperature-dependent crossover current determined by the thermal
critical exponent. From a dynamic scaling analysis we determine
this critical exponent and the thermally activated behavior of the
linear resistivity. The results are in agreement with earlier
calculations using the resistively shunted-junction model for the
dynamics of the array.