Europhys. Lett., 63 (5) , pp. 750-756 (2003)
Two dynamic exponents in the resistive transition of fully frustrated Josephson-junction arraysE. Granato1 and D. Domínguez2
1 Laboratório Associado de Sensores e Materiais Instituto Nacional de Pesquisas Espaciais 12201-190 São José dos Campos, São Paulo, Brazil
2 Centro Atômico Bariloche - 8400 San Carlos de Bariloche, Rio Negro, Argentina
(Received 10 December 2002; accepted in final form 20 June 2003)
We study the resistive transition in Josephson-junction arrays at f=1/2 flux quantum per plaquette by dynamical simulations of the resistively-shunted-junction model. The current-voltage scaling and critical dynamics of the phases are found to be well described by the same critical temperature and static exponents as for the chiral (vortex-lattice) transition. Although this behavior is consistent with a single-transition scenario, where phase and chiral variables order simultaneously, two different dynamic exponents result for phase coherence and chiral order.
74.81.Fa - Josephson junction arrays and wire networks.
64.60.Cn - Order-disorder transformations; statistical mechanics of model systems.
74.25.Qt - Vortex lattices, flux pinning, flux creep.
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