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Thickness dependence of the soft ferroelectric mode in SrTiO3 thin films deposited on MgO by Ikufumi Katayama; Hiroshi Shimosato; Masaaki Ashida; Iwao Kawayama; Masayoshi Tonouchi; Tadashi Itoh is a Materials Science article available to read on EtoBox.
What is Thickness dependence of the soft ferroelectric mode in SrTiO3 thin films deposited on MgO about?
We have measured the complex dielectric constants of SrTiO 3 thin films deposited on MgO substrate, by using the broadband terahertz time-domain spectroscopy. The dielectric dispersion of SrTiO 3 thin films with thickness of 1046, 460 and 55 nm has been observed in the frequency range from 0.1 to 8 THz. The dispersion mainly consists of the TO1 ferroelectric soft mode with a slight absorption of the TO2 phonon mode. From the analysis of the obtained dispersion, we found that the soft mode frequency hardens as the thickness of the film becomes thinner, and is extremely large compared with the bulk crystals. The damping of the soft mode is also larger than that of bulk SrTiO 3 , which suggests the extrinsic nature of the broadening of the soft mode dispersion. In the thinnest film of 55 nm, even the shape of the dielectric dispersion changes, which may be related to integrated defects near the interface.
Who reads Thickness dependence of the soft ferroelectric mode in SrTiO3 thin films deposited on MgO?
It is typically read by researchers, students, and practitioners in Materials Science.
- Author
- Ikufumi Katayama; Hiroshi Shimosato; Masaaki Ashida; Iwao Kawayama; Masayoshi Tonouchi; Tadashi Itoh
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 0022-2313)
- Published
- 2008
- Language
- EN
- Field
- Materials Science (Physical Sciences)