STATIC AND DYNAMIC PROPERTIES OF DOMAIN-WALLS IN KDP-TYPE CRYSTALS

We have studied properties of domain walls within the mean field appro ximation of the pseudospin model appropriate for the description of KD P-type crystals. Besides the planar structure the domain wall of the s tep-like shape has been considered. The energetical barriers controlli ng the movement of the walls over the unit cells strongly depend on th e temperature and causes slowing-down of the dynamics on cooling. In c ontrast to it the relaxation of domain walls localized inside a unit c ell shifts to higher frequencies with decreasing temperature.