Abstract
Abstract Domain walls in crystals with preceding incommensurate phases are discussed. The factors which stabilize the incommensurate phases with decreasing temperatures, prior to the commensurate phase, affect the spatial variation of the order parameters in the commensurate phase. In the type-II incommensurate phase like in NaNO2, the spatial variation of order parameters shows the “overshoot” and the “oscillation” in approaching the equilibrium values in the domains. In the type-I incommensurate phases like in K2SeO4, the Lifshitz invariant makes the feature of domain walls different according to how two domains are disposed. The domain wall kinetics will be briefly mentioned for the type-II case, using a lattice model.
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