Roughness of a single flux line in type-II superconductor with point-like pins

摘要

The static and dynamic properties of a single flux line in type-II superconductors with point-like pinning centers are studied by using Langevin dynamics simulations. The roughness W~2 of flux line has a powerlaw relation with line length N along magnetic field, i.e., W~2 ～ N~(2f) with the equilibrium roughness exponent ζ ≈ 0.5 at high temperature and ζ ≈ 0.6 at low temperature. Moreover, the creep motion of single flux line is simulated and the creep formula is checked.