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Polarized Raman scattering of epitaxial PbTiO3 thin films with coexisting c- and a-domains

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Authors
Lee, Sun-Hwa; Jang, Hyun M.; Cho, Seong M.; Yi, Gyu-Chul
Issue Date
2002-04-29
Publisher
American Institute of Physics
Citation
Appl. Phys. Lett. 80, 3165 (2002)
Keywords
SOFT PHONONMODES
Abstract
Effects of the orientation of ferroelectric domains on the characteristics of polarized Raman spectra were studied using an epitaxially grown PbTiO3 thin film in which the c-axis oriented domains coexist with the a-axis oriented domains on MgO (001). To obtain polarized spectra for both two distinctive c and a domains, we have employed scattering configurations in which the relevant phonon wave vector, k, is perpendicular to the c axis of the tetragonal unit cell. Compared with the mode frequencies of single-crystal PbTiO3, a softening of the E(TO) phonons was evident for both c and a domains, suggesting the presence of a strong tensile film stress. In addition to this, we observed a splitting of the degenerate "silent" mode into two distinctive B-1 and E modes in an epitaxially grown film on MgO (001). (C) 2002 American Institute of Physics.
ISSN
0003-6951 (print)
1077-3118 (online)
Language
English
URI
http://hdl.handle.net/10371/4904

http://link.aip.org/link/?APPLAB/80/3165/1
DOI
https://doi.org/10.1063/1.1473864

https://doi.org/10.1063/1.1473864
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College of Natural Sciences (자연과학대학)Dept. of Physics and Astronomy (물리·천문학부)Physics (물리학전공)Journal Papers (저널논문_물리학전공)
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