The interaction of Abrikosov's vortices in superconductors with superlattice of voids

The interaction between a vortex lattice and an ordered structure of defects - a superlattice of voids - is studied. It is shown that if the vortex - defect interaction is rather high, there appear new structures with a constant density of vortices within certain ranges of magnetic fields and the symmetry of these structures does not necessarily coincide with that of the superlattice of voids. At boundaries of these intervals there occur type I phase transitions (PT) related to modification in the vortex structure or type II PT caused by the generation of additional vortices or vortex vacancies