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| 005 | 20230426083044.0 | ||
| 017 | _ | _ | |a This version is available at the following Publisher URL: http://prb.aps.org |
| 024 | 7 | _ | |a 10.1103/PhysRevB.66.235406 |2 DOI |
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| 084 | _ | _ | |2 WoS |a Physics, Condensed Matter |
| 100 | 1 | _ | |a Ostapchuk, T. |b 0 |0 P:(DE-HGF)0 |
| 245 | _ | _ | |a Origin of soft-mode stiffening and reduced dielectric response in SrTiO3 thin films |
| 260 | _ | _ | |a College Park, Md. |b APS |c 2002 |
| 300 | _ | _ | |a 235406 |
| 336 | 7 | _ | |a Journal Article |0 PUB:(DE-HGF)16 |2 PUB:(DE-HGF) |
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| 336 | 7 | _ | |a article |2 DRIVER |
| 440 | _ | 0 | |a Physical Review B |x 1098-0121 |0 4919 |v 66 |
| 500 | _ | _ | |a Record converted from VDB: 12.11.2012 |
| 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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| 700 | 1 | _ | |a Petzelt, J. |b 1 |0 P:(DE-HGF)0 |
| 700 | 1 | _ | |a Zelezny, V. |b 2 |0 P:(DE-HGF)0 |
| 700 | 1 | _ | |a Pashkin, A. |b 3 |0 P:(DE-HGF)0 |
| 700 | 1 | _ | |a Pokorny, J. |b 4 |0 P:(DE-HGF)0 |
| 700 | 1 | _ | |a Drbohlav, I. |b 5 |0 P:(DE-HGF)0 |
| 700 | 1 | _ | |a Kuzel, R. |b 6 |0 P:(DE-HGF)0 |
| 700 | 1 | _ | |a Rafaja, D. |b 7 |0 P:(DE-HGF)0 |
| 700 | 1 | _ | |a Gorshunov, B. P. |b 8 |0 P:(DE-HGF)0 |
| 700 | 1 | _ | |a Dressel, M. |b 9 |0 P:(DE-HGF)0 |
| 700 | 1 | _ | |a Ohly, Ch. |b 10 |u FZJ |0 P:(DE-Juel1)VDB22121 |
| 700 | 1 | _ | |a Hoffmann-Eifert, S. |b 11 |u FZJ |0 P:(DE-Juel1)VDB3102 |
| 700 | 1 | _ | |a Waser, R. |b 12 |u FZJ |0 P:(DE-Juel1)131022 |
| 773 | 1 | 8 | |a 10.1103/physrevb.66.235406 |b American Physical Society (APS) |d 2002-12-13 |n 23 |p 235406 |3 journal-article |2 Crossref |t Physical Review B |v 66 |y 2002 |x 0163-1829 |
| 773 | _ | _ | |a 10.1103/PhysRevB.66.235406 |g Vol. 66, p. 235406 |p 235406 |n 23 |q 66<235406 |0 PERI:(DE-600)2844160-6 |t Physical review / B |v 66 |y 2002 |x 0163-1829 |
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