Vortex line lattice: structure and dynamics

This thesis deals with a number of properties of the vortex lattice in high-temperature superconducting materials. Novel vortex lattice structures, other than the conventional one, are investigated. They are found to be energetically more stable for layered superconductors and for moderately anisotropic superconductors containing columnar defects;The dynamics of the vortex lattice, and in particular the magnetic hysteresis which arises because of the geometrical barrier in superconducting strips, is also studied. Its effect on the magnetization in both the absence and presence of the bulk pinning, as well as the time evolution of the vortex penetration into superconducting strips are investigated