Dynamical phase transition in two-dimensional fully frustrated Josephson junction arrays with resistively shunted junction dynamics
Department of Physics, Zhejiang University, Hangzhou 310027, P.R. China
Corresponding author: a email@example.com
Revised: 29 May 2003
Published online: 2 October 2003
The dynamical phase transitions in two-dimensional fully frustrated Josephson junction arrays at zero temperature are investigated numerically with the resistively shunted junction model through the fluctuating twist boundary condition. The model is subjected to a driving current with nonzero orthogonal components ix, iy parallel to both axes of the square lattice. We find a roughly lattice size independent phase diagram with three dynamical phases: a pinned vortex lattice phase, a moving vortex lattice phase and a moving plastic phase. The phase diagram shows a direct transition from the pinned vortex to the moving vortex phase and the separation of the pinned vortex and the moving plastic phases. The time-dependent voltages vx and vy are periodic in the moving vortex lattice phase. But they are aperiodic in the moving plastic phase, resulting in non-monotonic characteristics and hysteresis in the current-voltage curves. It is found that the characteristic frequency is twice the time-averaged voltage in the moving vortex phase and around the time-averaged voltage in the plastic flow regime.
PACS: 64.60.Ht – Dynamic critical phenomena / 74.25.Sv – Critical currents / 74.25.Fy – Transport properties
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2003