A theoretical model was proposed that described split grain-boundary dislocations in the low-angle tilt boundaries of high-temperature superconductors. It was shown that the dissociation of dislocations in low-angle tilt boundaries was usually accompanied by a decrease in their elastic energy and this caused an increase in the critical current density across the boundaries.

Dislocation Structure and Transport Properties of Low-Angle Tilt Boundaries in High-Temperature Superconductors. S.V.Bobylev, I.A.Ovidko: Technical Physics, 2003, 48[6], 722-6