2007
DOI: 10.1103/physrevlett.98.257601
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Coupled Ultrafast Lattice and Polarization Dynamics in Ferroelectric Nanolayers

Abstract: We report the first analysis of the polarization and lattice dynamics in a metal/ferroelectric/metal nanolayer system by femtosecond x-ray diffraction. Two Bragg reflections provide information on the coupled dynamics of the two relevant phonon modes for ferroelectricity in perovskites, the tetragonal distortion and the soft mode. Optical excitation of the SrRuO(3) metal layers generates giant stress (>1 GPa) compressing the PbZr(0.2)Ti(0.8)O(3) layers by up to 2%. The resulting change of tetragonality reaches… Show more

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Cited by 122 publications
(106 citation statements)
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References 27 publications
(24 reference statements)
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“…As discussed in Ref. [25], the (0 0 56) peak is located at a Bragg angle where the slope of the PZT and SRO envelope functions is substantial, making the intensity of this peak most sensitive to angular shifts of the envelopes by transient changes of the individual layer thicknesses. In this way, motions along the coordinate η become visible directly.…”
Section: Lattice Dynamics Of Ferroelectric Superlatticesmentioning
confidence: 99%
See 1 more Smart Citation
“…As discussed in Ref. [25], the (0 0 56) peak is located at a Bragg angle where the slope of the PZT and SRO envelope functions is substantial, making the intensity of this peak most sensitive to angular shifts of the envelopes by transient changes of the individual layer thicknesses. In this way, motions along the coordinate η become visible directly.…”
Section: Lattice Dynamics Of Ferroelectric Superlatticesmentioning
confidence: 99%
“…2(a)) [25]. The SL was grown on a STO substrate and consists of a 60 nm thick SRO bottom layer followed by 15 pairs of PZT (Fig.…”
Section: Lattice Dynamics Of Ferroelectric Superlatticesmentioning
confidence: 99%
“…Ferroelectric (FE) and related materials are of great importance for many device applications 1 . For some of these applications and for fundamental reasons, the dynamical properties of these materials need to be determined and understood, especially when realizing that surprises can be in store when they are investigated [2][3][4][5][6][7][8][9] . For instance, some recent studies discovered that BaTiO 3 has two (rather than one, as believed for more than 30 years) modes contributing to its dielectric response in the THz range, both in the paraelectric and FE tetragonal phases 2,3 .…”
Section: Jirka Hlinkamentioning
confidence: 99%
“…The knowledge of the time-resolved structural response to an ultrafast optical stimulus is essential for the understanding of various condensed matter phenomena. [1][2][3][4] The udkm1Dsim toolbox is a collection of classes and routines to model 1D crystalline sample structures on the atomic level and to simulate incoherent (heat diffusion) as well as coherent lattice dynamics (acoustic phonons) by semi-coupled equations of thermoelasticity. [5,6] The resulting transient X-ray diffraction response for the 1D sample structure is computed by dynamical X-ray theory.…”
Section: Introductionmentioning
confidence: 99%