We apply the complete nonlinear Time Dependent Ginzburg Landau (TDGL) equations to study the vortex dynamics in a mesoscopic type II superconductor using the numerical method based on the technique of gauge invariant variables. The solution of these equations shows how the vorticity penetrates into and goes out of the superconductor through the surface boundary. We calculate the spatial distribution of the superconducting electron density and the phase of the superconducting order parameter in a mesoscopic superconducting square sample containing two holes in the presence of a uniform perpendicular magnetic field. The dynamics of different vortex states are studied as a function of the external magnetic field.

Millimeter-sized single crystals of CaLaBaCu3O7-delta were grown by the conventional self-flux technique. In this report we present a characterization of the structural and morphological properties of our first time grown single crystals. X-Ray diffraction patterns show that the unit cell of the samples corresponds to a tetragonal structure. SEM images evidence excellent morphological properties without presence of twins. EDX measurements show the difficulty of Ca to enter in the structure. The implications of our results are extensively presented and discussed.

The anisotropic effects on the dynamical phases of a vortex lattice driven by a uniform Lorentz force are investigated by numerical simulations. A square array of columnar defects is represented by a periodic pinning potential. We assume that ow is elastic, so that the vortex-vortex interactions can be represented by elastic forces. V-I characteristics and mean-square displacements and velocities for different orientations of the driving force are calculated. It is found that, for a wide range of driving force magnitude and orientation, the vortex lattice is transversely pinned in high symmetry directions of the pinning potential. In addition, the transverse pinned vortex lattice is thermally depinned at high enough temperatures.

Current and magnetic field profiles of bent strips in external magnetic fields and with applied currents are numerically calculated. The flat strip is correctly obtained as the limiting case of bent strips when the bend angle is zero. The Meissner response and the flux penetration are studied, the latter under the consideration of high critical currents and small bends. The dependence of these profiles on the creep exponent (by a material relation E alpha (j / jc)n) is also studied. In the presence of an external magnetic field the flux penetration is delayed in bent strips compared with at strips. In the case of an applied current the flux penetration from the strip edge is also delayed, but a flux front starting from the corner is also observed.