Average vortex velocity versus driving force for a field value slightly above the matching field, with the pinning sites located in a square array. The driving force is increased from 0 to 0.8. Several remarkable jumps in the curve can be clearly seen which correspond to transitions in the dynamical behavior of the driven lattice. The vortices are represented by black dots and pinning sites by open circles. For clarity, only a section of the sample is shown.
Dynamic phase diagrams with a square pinning lattice.
For ratios greater than 1, regions I through V can be observed, with the disordered region III growing and the ordered-flow regions II and IV reducing in size. 1D Incommensurate flow Return to main page.