Splitting of the superconducting transition in the two weakly coupled 2D XY models

摘要

The frequency omega and temperature T dependent complex conductivity sigma of two weakly coupled 2D XY models subject to the resistively shunted junction dynamics is studied through computer simulations. A double dissipation-peak structure in Re[omegasigma] is found as a function of T for a fixed frequency. The characteristics of this double peak structure, as well as its frequency dependence, is investigated with respect to the difference in the critical temperatures of the two XY models, originating from their different coupling strengths. The similarity with the experimental data in Festin et al. (this issue) for a thin YBCO film is pointed out and some possible implications are suggested. (C) 2001 Elsevier Science B.V. All rights reserved. [References: 17]