%0 Journal Article
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%@resumeid 8JMKD3MGP5W/3C9JH2J
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%3 zero temperature.pdf
%X The critical behavior of zero-temperature superconducting transitions which can occur in disordered two-dimensional Josephson-junction arrays are investigated by Monte Carlo calculation of ground-state excitation energies and dynamical simulation of the current-voltage characteristics at nonzero temperatures. Two models of arrays in an applied magnetic field are considered: random dilution of junctions and random couplings with half-flux quantum per plaquette f=1/2. Above a critical value of disorder, finite-size scaling of the excitation energies indicates a zero-temperature transition and allows an estimate of the critical disorder and the thermal correlation length exponent characterizing the transition. Current-voltage scaling is consistent with the zero-temperature transition. The linear resistance is nonzero at finite temperatures but nonlinear behavior sets in at a characteristic current density determined by the thermal critical exponent. The zero-temperature transition provides an explanation of the washing out of structure for increasing disorder at f=1/2 while it remains for f=0, observed experimentally in supercondoucting wire networks.
%8 Sept.
%N 3
%T Zero-temperature superconducting transition in frustrated Josephson-junction arrays
%@secondarytype PRE PN
%K SENSORS AND MATERIALS, Zero-temperature superconducting, Josephson junction array, Monte Carlo simulation, Current-voltage characteristics, Magnetic field, Quenched disorder, Phase transitions, Wire networks, Glass models, Coherence, threshold, Behavior, State, SENSORES E MATERIAIS, Supercondução a zero temperatura, Arranjo da junção de Josephson, Simulação de Monte Carlo, Características da voltagem corrente, Camps magnéticos, Comportamento, Estado.
%@visibility shown
%@group LAS-INPE-MCT-BR
%@secondarykey INPE-13281-PRE/8523
%@copyholder SID/SCD
%@issn 0103-9733
%2 sid.inpe.br/iris@1916/2005/05.12.11.26.41
%@affiliation Instituto Nacional de Pesquisas Espaciais, Laboratório Associado de Sensores e Materiais (INPE.LAS)
%@project MATCON: Física da matéria condensada
%B Brazilian Journal of Physics
%P 699-704
%4 sid.inpe.br/iris@1916/2005/05.12.11.26
%D 2002
%V 32
%A Granato, Enzo,
%@dissemination WEBSCI; PORTALCAPES; SCIELO.
%@area FISMAT