The Transport Properties Of The Vortex Matter In A Disordered Environment

In a disordered environment the vortex lattice system of type-â…¡ superconductor which driven by the external force shows complex dynamic phenomena. Many factors in the system, for example, periodicity, nonlinearity, make these phenomena become more complex. As a typical example, vortex lattice system of type-â…¡ superconductor with random pinning potentials has attracted considerable attention both experimentally and theoretically. A better understanding of various nonequilibrium phases and phase transitions is not only essential for explaining the nonlinear current-voltage characteristics observed in experiments, but also closely related to an important class of phenomena, such as Wigner crystals driven by external voltage and the moving of colloid in the electric field.In this paper, the nonequilibrium phase transitions of vortex matter with a strong random pinning potential in layered superconductors is employed by the three-dimensional (3D) frustrated anisotropic XY model and resistively-shunted junction dynamics when the magnetic field perpendicular to the superconducting plane. We investigate the dynamic phase transitions of the system at the low T=0.01, middle T=0.12and high T=0.22temperatures respectively. As the current increases, it is observed that the system has three phase transitions and the reordering phase transition shows up at the low temperature:the moving vortex glass, the moving Bragg glass, the moving smectic, the moving liquid, however, does not occur at the high temperature. More interesting, we find that the reordering phase transition occurs twice at the middle temperature.