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Inhomogeneous states of a thin-film incommensurate ferroelectric |
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| Authors: | S. A. Ktitorov O. S. Pogorelova E. V. Charnaya |
| Affiliation: | (1) Ioffe Physicotechnical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021, Russia;(2) St. Petersburg Mechnikov State Medical University, St. Petersburg, 195067, Russia;(3) Fock Institute of Physics, St. Petersburg State University, ul. Pervogo Maya 100, Petrodvorets, St. Petersburg, 198504, Russia |
| Abstract: | Nonuniform distributions of the order parameter in a film of an incommensurate ferroelectric whose free energy expansion does not contain Lifshitz invariants are considered. An equation describing the order parameter distribution over the film thickness is derived in the approximation of slowly varying amplitudes. The effect of film thickness and surface properties on the temperature of transition to the incommensurate phase is analyzed. |
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