Effects of BaTiO3 overlayers deposited on SrTiO3(001) on its 105 K phase transition
| Autor: | Syuichi Doi, Isao Takahashi, Kiyoshi Sakaue, Hikaru Terauchi, Amane Kitahara, Kyohiko Matsushita |
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| Rok vydání: | 2005 |
| Předmět: |
Phase transition
Materials science Condensed matter physics business.industry Critical phenomena Surface stress Bragg's law Surfaces and Interfaces General Chemistry Condensed Matter Physics Surfaces Coatings and Films Overlayer Surface tension chemistry.chemical_compound Reflection (mathematics) Optics chemistry Materials Chemistry Strontium titanate business |
| Zdroj: | Surface and Interface Analysis. 37:145-148 |
| ISSN: | 1096-9918 0142-2421 |
| Popis: | We investigated effects of a BaTiO3 overlayer deposited epitaxially on an SrTiO3(001) surface on the 105 K phase transition of SrTiO3. With the use of x-ray reflectivity and Bragg reflection we observed the critical behaviour of the 105 K phase transition in the interfacial region and in the bulk. For T < Tc(Tc = 105 K), rocking-curve-widths of x-ray reflectivity and of Bragg reflections are found to exhibit power law behaviour (Tc − T)2β, where β obtained by x-ray reflectivity (βINTERFACE) is almost the same as that obtained by Bragg reflection (βBULK = 0.34 ± 0.02). The present result shows a sharp contrast to the critical behaviour of SrTiO3 having free SrTiO3(001) surfaces, where 2βSURFACE ≈ βBULK is reported. In this study, we find that the critical behaviour of the BaTiO3/SrTiO3 interface is influenced significantly by the surface condition generated by the epitaxial cap layer. It is likely that a change of dimensionality and/or tensile stress at the interface could affect the critical behaviour of this interfacial region. Copyright © 2005 John Wiley & Sons, Ltd. |
| Databáze: | OpenAIRE |
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