| Autor: |
Gartnerova, V. (V.), Pacherova, O. (O.), Klinger, M. (M.), Jelinek, M. (M.), Jager, A. (A.), Tyunina, M. (M.) |
| Jazyk: |
angličtina |
| Rok vydání: |
2017 |
| Předmět: |
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| Popis: |
Epitaxy of perovskite oxide ferroelectric heterostructures with large lattice misfit is crucial for numerous emerging applications. Here we demonstrate cube-on-cube-type epitaxial growth of BaTiO₃ films on strongly mismatched (001)SrTiO₃ single-crystal substrates for the films with thicknesses significantly larger than that of misfit relaxation. The films experience strain originating from the film-substrate thermal expansion mismatch. Using a dedicated digital analysis of electron microscopy images, we show that the films contain random nanoregions of substantial strain fluctuations: the local strains vary in the range of ∼(0.5–2)% compared with the average strain magnitude of ∼1%. Because of strong strain-polarization coupling in ferroelectrics, fluctuations of strain produce fluctuations of polarization, which are suggested to cause relaxor-like properties in many mismatched heterostructures. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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