Influence of the growth mechanism and thermoelastic stresses on the lattice dynamics of heteroepitaxial films of barium strontium titanate

Yuzyuk, Yu. I.; Zakharchenko, I. N.; Alyoshin, V. A.; Leont’ev, I. N.; Rabkin, L. M.; Мухортов, В. М.; Simon, Patrick

doi:10.1134/s1063783407090247

Cited by 11 publications

(6 citation statements)

References 23 publications

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“…Obviously, the two dimensional stresses reduce the symmetry of the paraelectric phase from cubic to tetragonal [121][122][123]. It is important to note D 4h 1 that the value of two dimensional stresses in the films depends on the growth mechanism during the film deposition, which makes it possible within particular limits to vary the temperature of the ferroelectric tran sition [124].…”

Section: Films Of (Basr)tio 3 Solid Solutionsmentioning

confidence: 99%

Raman scattering spectra of ceramics, films, and superlattices of ferroelectric perovskites: A review

Yuzyuk

2012

Phys. Solid State

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104

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Section: Films Of (Basr)tio 3 Solid Solutionsmentioning

confidence: 99%

Raman scattering spectra of ceramics, films, and superlattices of ferroelectric perovskites: A review

Yuzyuk

2012

Phys. Solid State

Self Cite

104

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“…Moreover, Ba 0.8 Sr 0.2 TiO 3 has several infrared active phonon modes in THz range that can be driven resonantly by THz radiation. One of these modes is the soft mode having the frequency Ω = 46 cm −1 (1.67 THz) at room temperature 39 . Magnesium oxide (MgO) is widely used as a substrate for thin films and heterostructures 40 .…”

Section: Methodsmentioning

confidence: 99%

Transient Second Harmonic Generation Induced by Single Cycle THz pulses in Ba0.8Sr0.2TiO3/MgO

Grishunin

Bilyk

Sherstyuk

et al. 2019

Sci Rep

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The ability to switch ferroics (magnets, ferroelectrics, multiferroics) between two stable bit states is the main principle of modern data storage technology. Due to many new ideas, originating from fundamental research during the last 50 years, this technology has developed in a breath-taking fashion. Ever increasing demands for faster and more energy efficient data storage strongly motivate fundamental studies of dynamics in ferroics triggered by ultrashort stimuli. It has been recently realized that nearly single cycle intense THz pulses and the phenomenon of the second harmonic generation are appealing tools for excitation and detection of poorly understood ultrafast dynamics of electric polarization in ferroelectrics at the picosecond timescale. Here we investigate picosecond dynamics of second harmonic from near-infrared pulse in ferroelectric heterostructure Ba0.8Sr0.2TiO3/MgO triggered by the electric field of a nearly single cycle intense THz pulse. The dynamics of the nonlinear optical signal is characterized by a step and oscillations at the frequency of about 1.67 THz. Although the observations can be mistakenly interpreted as oscillations of the electric polarization at the frequency of the soft mode and switching of the order parameter to another metastable state, here we show that the THz modulation of second harmonic generation in Ba0.8Sr0.2TiO3/MgO has a purely optical origin. The observation can be explained assuming that the THz pulse is a relativistically propagating inhomogeneity which induces center of symmetry breaking and linear birefringence. Our work reveals the role of propagation effects in interpretation of time-resolved non-linear optical experiments and thus it has important implications for experimental studies of ultrafast dynamics in ferroics.

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“…In the ferroelectric phase below the Curie temperature (Tc = 353 K they have a tetragonal unit cell (space group P4mm, point group 4mm). At room temperature, the soft mode is overdamped with the following parameters: Ω = 46 cm −1 (2.40 THz), ΔΩ = 50 cm −1 (1.5 THz) 36 , 37 . The as-grown film consists of 180-degrees domains which are not compensated due to an interfacial strain and show built-in polarization in the [001] crystallographic direction 37 , 38 .…”

Section: Methodsmentioning

confidence: 99%

THz Electric Field-Induced Second Harmonic Generation in Inorganic Ferroelectric

Grishunin

Ilyin

Sherstyuk

et al. 2017

Sci Rep

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Second Harmonic Generation induced by the electric field of a strong nearly single-cycle terahertz pulse with the peak amplitude of 300 kV/cm is studied in a classical inorganic ferroelectric thin film of (Ba0.8Sr0.2)TiO3. The dependences of the SHG intensity on the polarization of the incoming light is revealed and interpreted in terms of electric polarization induced in the plane of the film. As the THz pulse pumps the medium in the range of phononic excitations, the induced polarization is explained as a dynamical change of the ferrolectric order parameter. It is estimated that under action of the THz pulse the ferroelectric order parameter acquires an in-plane component up to 6% of the net polarization.

show abstract

Influence of the growth mechanism and thermoelastic stresses on the lattice dynamics of heteroepitaxial films of barium strontium titanate

Cited by 11 publications

References 23 publications

Raman scattering spectra of ceramics, films, and superlattices of ferroelectric perovskites: A review

Raman scattering spectra of ceramics, films, and superlattices of ferroelectric perovskites: A review

Transient Second Harmonic Generation Induced by Single Cycle THz pulses in Ba0.8Sr0.2TiO3/MgO

THz Electric Field-Induced Second Harmonic Generation in Inorganic Ferroelectric

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