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000032287 0247_ $$2DOI$$a10.1103/PhysRevB.66.235406
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000032287 084__ $$2WoS$$aPhysics, Condensed Matter
000032287 1001_ $$0P:(DE-HGF)0$$aOstapchuk, T.$$b0
000032287 245__ $$aOrigin of soft-mode stiffening and reduced dielectric response in SrTiO3 thin films
000032287 260__ $$aCollege Park, Md.$$bAPS$$c2002
000032287 300__ $$a235406
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000032287 440_0 $$04919$$aPhysical Review B$$v66$$x1098-0121
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000032287 520__ $$aThe problem of the reduced dielectric response in thin films of high-permittivity materials is analyzed by studying the soft-mode response in several SrTiO3 thin films by means of Fourier transform far infrared, monochromatic submillimeter, and micro-Raman spectroscopies. A 300-nm-thick metalorganic chemical vapor deposition film, quasiepitaxially grown on a (0001) sapphire substrate with a perfect <111> orientation, displays a ferroelectric transition near 125 K induced by a tensile residual stress, appearing apparently simultaneously with the antiferrodistortive transition. On the other hand, polycrystalline chemical solution deposition films grown on (0001) sapphire, and also tensile stressed, show a harder soft mode response without the appearance of macroscopic ferroelectricity. This effect, which increases with the film thickness, is explained by a strong depolarizing field induced by the percolated porosity and cracks (in the 10-nm scale) along the boundaries of columnar grains (normal to the probe field direction). Brick-wall model calculations showed that 0.2 vol. % of such a porosity type reduces the permittivity from 30000 to less than 1000. The activation of the forbidden IR modes in the Raman spectra in the whole 80-300-K temperature range studied is explained by the effect of polar grain boundaries, in analogy with the bulk ceramics.
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000032287 7001_ $$0P:(DE-HGF)0$$aPetzelt, J.$$b1
000032287 7001_ $$0P:(DE-HGF)0$$aZelezny, V.$$b2
000032287 7001_ $$0P:(DE-HGF)0$$aPashkin, A.$$b3
000032287 7001_ $$0P:(DE-HGF)0$$aPokorny, J.$$b4
000032287 7001_ $$0P:(DE-HGF)0$$aDrbohlav, I.$$b5
000032287 7001_ $$0P:(DE-HGF)0$$aKuzel, R.$$b6
000032287 7001_ $$0P:(DE-HGF)0$$aRafaja, D.$$b7
000032287 7001_ $$0P:(DE-HGF)0$$aGorshunov, B. P.$$b8
000032287 7001_ $$0P:(DE-HGF)0$$aDressel, M.$$b9
000032287 7001_ $$0P:(DE-Juel1)VDB22121$$aOhly, Ch.$$b10$$uFZJ
000032287 7001_ $$0P:(DE-Juel1)VDB3102$$aHoffmann-Eifert, S.$$b11$$uFZJ
000032287 7001_ $$0P:(DE-Juel1)131022$$aWaser, R.$$b12$$uFZJ
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