This title appears in the Scientific Report :
2002
Please use the identifier:
http://hdl.handle.net/2128/1244 in citations.
Please use the identifier: http://dx.doi.org/10.1103/PhysRevB.66.235406 in citations.
Origin of soft-mode stiffening and reduced dielectric response in SrTiO3 thin films
Origin of soft-mode stiffening and reduced dielectric response in SrTiO3 thin films
The problem of the reduced dielectric response in thin films of high-permittivity materials is analyzed by studying the soft-mode response in several SrTiO3 thin films by means of Fourier transform far infrared, monochromatic submillimeter, and micro-Raman spectroscopies. A 300-nm-thick metalorganic...
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Personal Name(s): | Ostapchuk, T. |
---|---|
Petzelt, J. / Zelezny, V. / Pashkin, A. / Pokorny, J. / Drbohlav, I. / Kuzel, R. / Rafaja, D. / Gorshunov, B. P. / Dressel, M. / Ohly, Ch. / Hoffmann-Eifert, S. / Waser, R. | |
Contributing Institute: |
Elektrokeramische Materialien; IFF-EKM |
Published in: | Physical Review B Physical review / B, 66 66 (2002 2002) 23 23, S. 235406 235406 |
Imprint: |
College Park, Md.
APS
2002
|
Physical Description: |
235406 |
DOI: |
10.1103/PhysRevB.66.235406 |
Document Type: |
Journal Article |
Research Program: |
Materialien, Prozesse und Bauelemente für die Mikro- und Nanoelektronik |
Series Title: |
Physical Review B
66 |
Subject (ZB): | |
Link: |
OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1103/PhysRevB.66.235406 in citations.
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520 | |a The problem of the reduced dielectric response in thin films of high-permittivity materials is analyzed by studying the soft-mode response in several SrTiO3 thin films by means of Fourier transform far infrared, monochromatic submillimeter, and micro-Raman spectroscopies. A 300-nm-thick metalorganic chemical vapor deposition film, quasiepitaxially grown on a (0001) sapphire substrate with a perfect <111> orientation, displays a ferroelectric transition near 125 K induced by a tensile residual stress, appearing apparently simultaneously with the antiferrodistortive transition. On the other hand, polycrystalline chemical solution deposition films grown on (0001) sapphire, and also tensile stressed, show a harder soft mode response without the appearance of macroscopic ferroelectricity. This effect, which increases with the film thickness, is explained by a strong depolarizing field induced by the percolated porosity and cracks (in the 10-nm scale) along the boundaries of columnar grains (normal to the probe field direction). Brick-wall model calculations showed that 0.2 vol. % of such a porosity type reduces the permittivity from 30000 to less than 1000. The activation of the forbidden IR modes in the Raman spectra in the whole 80-300-K temperature range studied is explained by the effect of polar grain boundaries, in analogy with the bulk ceramics. | ||
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