  A controlled local enhancement of superconductivity yields unexpected
modifications in the vortex dynamics. This local enhancement has been achieved
by designing an array of superconducting Nb nanostructures embedded in a V
superconducting film. The most remarkable findings are: i) vanishing of the
main commensurability effect between the vortex lattice and the array unit
cell, ii) hysteretic behavior in the vortex dynamics, iii) broadening of the
vortex liquid phase and iv) strong softening of the vortex lattice. These
effects can be controlled and they can be quenched by reducing the Nb array
superconducting performance applying an in-plane magnetic field. These results
can be explained by taking into account the repulsive potential landscape
created by the superconducting Nb nanostructures on which vortices move.
