Growth Kinetics of Domain Structures of Crystal with an Incommensurate Phase ---The Case of No Lifshitz Invariant---

Abstract

Domain structures formed by quench in the NaNO₂-type crystals, whose incommensurate phase transition can be reproduced by thethermodynamic potential with no Lifshitz invariant, have been studiedby solving the kinetic equation numerically, adopting atwo-dimensional model. The temporal evolution of domain structures, consisting of positive and negative domains, is shown and analyzed. Ithas turned out that in the early stage the amplitude of the modulationwave with a specific wavenumber grows up and then the phase approachesthe stable state.