Ferroelectric phase transitions and dynamical behavior in KNbO{sub 3}/KTaO{sub 3} superlattices by molecular-dynamics simulation.
The phase transitions and dynamical behavior of superlattices consisting of equal-thickness layers of a perovskite ferroelectric (KNbO{sub 3}) and a perovskite paraelectric (KTaO{sub 3}) are explored using molecular-dynamics simulation. We find that the response in the plane and in the modulation direction are essentially decoupled. The Curie temperature for the transition from a polarized to unpolarized state in the modulation direction decreases approximately linearly with modulation length, {Lambda}, for {Lambda}>12; for smaller modulation lengths, it is essentially constant. The Curie temperature in the plane appears to be only weakly modulation-length dependent. We relate our results to experimental findings on the same system.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); FOR
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 949441
- Report Number(s):
- ANL/MSD/JA-40925; JAPIAU; TRN: US201012%%236
- Journal Information:
- J. Appl. Phys., Vol. 91, Issue 5 ; Mar. 1, 2002; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- ENGLISH
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