Current-voltage scaling of a Josephson-junction array at irrational frustration
Enzo Granato
DOI 10.1103/PhysRevB.54.R9655 · Physical Review B
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Abstract
Numerical simulations of the current-voltage characteristics of an ordered two-dimensional Josephson-junction array at an irrational flux quantum per plaquette are presented. The results are consistent with a scaling analysis that assumes a zero-temperature vortex-glass transition. The thermal-correlation length exponent characterizing this transition is found to be significantly different from the corresponding value for vortex-glass models in disordered two-dimensional superconductors. This leads to a current scale where nonlinearities appear in the current-voltage characteristics decreasing with temperature T roughly as T2 in contrast with the T3 behavior expected for disordered models.
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