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Investigation Of Nanoscale Dielectric Polarization And Refractive Indices Of BaTiO3 Surfaces And Ultrathin Films


 
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1. Title Title of document Investigation Of Nanoscale Dielectric Polarization And Refractive Indices Of BaTiO3 Surfaces And Ultrathin Films
 
2. Creator Author's name, affiliation, country H. Chaib; Polydisciplinary Faculty, Ibn Zohr University, P.O. Box 83, 45002 Ouarzazate; Morocco
 
2. Creator Author's name, affiliation, country L.M. Eng; Institute of Applied Photophysics, University of Technology, D-01062 Dresden; Germany
 
2. Creator Author's name, affiliation, country A. Nafidi; Condensed Matter Physics Group, Faculty of Sciences, Ibn Zohr University, Agadir; Morocco
 
2. Creator Author's name, affiliation, country A. Khalal; Condensed Matter Physics Group, Faculty of Sciences, Ibn Zohr University, Agadir; Morocco
 
2. Creator Author's name, affiliation, country A. Tirbiyine; Group of High Critical Temperature Superconductor Materials, Faculty of Sciences, Ibn Zohr University, Agadir; Morocco
 
2. Creator Author's name, affiliation, country A. Taoufik; Group of High Critical Temperature Superconductor Materials, Faculty of Sciences, Ibn Zohr University, Agadir; Morocco
 
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4. Description Abstract The surface and interface effects on the dielectric polarization and refractive indices of BaTiO3 single crystals and BaTiO3 ultrathin films on SrTiO3 single crystal substrates are investigated theoretically by using a microscopic model based on the orbital approximation in correlation with the dipole-dipole interaction. The spontaneous polarization of BaTiO3 single crystals is drastically reduced near the c-surface. For BaTiO3/SrTiO3 films, the spontaneous polarization is reduced in the film as its thickness decreases. However, an electronic polarization appears within the SrTiO3 substrate in the neighborhood of the interface. This polarization, which vanishes far away from the interface into the SrTiO3 bulk, is induced by the polarization of the BaTiO3 film. Furthermore, we find the refractive index either for BaTiO3 single crystals or for BaTiO3 films and SrTiO3 substrates to be strongly reduced for light polarized perpendicular to the surface.
 
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7. Date (YYYY-MM-DD) 21-03-2011
 
8. Type Status & genre Peer-reviewed Article
 
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9. Format File format PDF
 
10. Identifier Uniform Resource Identifier https://revues.imist.ma/index.php/MJCM/article/view/255
 
11. Source Title; vol., no. (year) Moroccan Journal of Condensed Matter; Vol 12, No 2 (2010)
 
12. Language English=en en
 
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15. Rights Copyright and permissions Copyright (c)