The self-energies and interaction energies of vacancies and interstitials in a triangular lattice of parallel Abrikosov vortices in type-II superconductors were calculated by using London theory. Stable and metastable equilibrium configurations of the flux-line lattice around such point defects were investigated. It was again shown that the vacancy of highest (6-fold) symmetry usually did not exhibit the lowest energy. Due to relaxation of the surrounding vortex lattice, the defect energies were very small when compared with the binding energy of a single vortex. The interaction of point defects was weak, and could be repulsive or attractive; depending upon their type and distance and upon the ratio of the magnetic penetration depth to the average vortex spacing.

E.Olive, E.H.Brandt: Physical Review B, 1998, 57[21], 13861-71