Critical behavior of frustrated Josephson junction arrays with bond disorder.
The scaling behavior of the current-voltage (IV) characteristics of a two-dimensional proximity-coupled Josephson junction array (JJA) with quenched bond disorder was investigated for frustrations f = 1/5, 1/3, 2/5, and 1/2. For all these frustrations including 1/5 and 2/5 where a strongly first-order phase transition is expected in the absence of disorder, the IV characteristics exhibited a good scaling behavior. The critical exponent nu indicates that bond disorder may drive the phase transitions to be continuous but not into the Ising universality class, contrary to what was observed in Monte Carlo simulations. The dynamic critical exponent z for JJA's was found to be only 0.60-0.77.
Yun
Young-Je
YJ
BK21 Physics Division and Institute of Basic Science, Sungkyunkwan University, Suwon 440-746, Korea.
Baek
In-Cheol
IC
Choi
Mu-Yong
MY