Interband transitions in epitaxial ferroelectric films of NaNbO3
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© 2015 American Physical Society (APS). This is the accepted version of the following article: Tyunina, M. & Chvostova, D. & Yao, L. D. & Dejneka, A. & Kocourek, T. & Jelinek, M. & van Dijken, S.. 2015. Interband transitions in epitaxial ferroelectric films of NaNbO3. Physical Review B. Volume 92, Issue 10. 104101/1-6. 2469-9950 (printed). DOI: 10.1103/physrevb.92.104101, which has been published in final form at http://journals.aps.org/prb/abstract/10.1103/PhysRevB.92.104101.
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2015
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Mcode
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Language
en
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104101/1-6
Series
Physical Review B, Volume 92, Issue 10
Abstract
The interband optical transitions in cube-on-cube-type epitaxial ferroelectric NaNbO3 thin films and a reference antiferroelectric NaNbO3 crystal are studied in the spectral range of 0.74–9 eV using variable-angle spectroscopic ellipsometry. The energies and the types of the transitions in the films are found to differ significantly from those in the crystal and to vary with epitaxial strain. The results are discussed in terms of epitaxial effects, including higher crystal symmetry, anisotropic lattice strain, and ferroelectric polarization in the NaNbO3 films compared to the crystal.Description
Keywords
ferroelectricity, optical transitions, band gap
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Citation
Tyunina, M. & Chvostova, D. & Yao, L. D. & Dejneka, A. & Kocourek, T. & Jelinek, M. & van Dijken, S.. 2015. Interband transitions in epitaxial ferroelectric films of NaNbO3. Physical Review B. Volume 92, Issue 10. 104101/1-6. 2469-9950 (printed). DOI: 10.1103/physrevb.92.104101.