Interfacial coherency and ferroelectricity of BaTiO3∕SrTiO3 superlattice films
| Autor: | Kj J. Choi, Dmitri A. Tenne, Sy Y. Hu, D. G. Schlom, Y. L. Li, Avadh Saxena, Q. X. Jia, C. B. Eom, X. X. Xi, L.Q. Chen, Turab Lookman, Arsen Soukiassian |
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| Rok vydání: | 2007 |
| Předmět: |
Diffraction
Phase transition Materials science Physics and Astronomy (miscellaneous) Condensed matter physics business.industry Superlattice Ferroelectricity Induced polarization Condensed Matter::Materials Science symbols.namesake Optics Condensed Matter::Superconductivity Phase (matter) symbols Orthorhombic crystal system business Raman spectroscopy |
| Zdroj: | Applied Physics Letters. 91:252904 |
| ISSN: | 1077-3118 0003-6951 |
| Popis: | We studied the phase transitions, domain morphologies, and polarizations in BaTiO3∕SrTiO3 superlattices grown on SrTiO3 substrates. Using the phase field approach, we discovered the remarkable influence of film/substrate interfacial coherency on the ferroelectricity of the SrTiO3 layers within a superlattice: it is an orthorhombic ferroelectric for an incoherent interface while it exhibits only induced polarization by the adjacent BaTiO3 layers for a coherent interface. We presented the domain morphologies within individual BaTiO3 and SrTiO3 layers which have different ferroelectric symmetries. The results are compared to ultraviolet Raman spectroscopy and variable temperature x-ray diffraction measurements. |
| Databáze: | OpenAIRE |
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