Evidence for Strain-Induced Ferroelectric Order in Epitaxial Thin-Film<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>KTaO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>

Tyunina, M.; Narkilahti, J.; Plekh, M.; Oja, Riku; Nieminen, Risto M.; Dejneka, A.; Трепаков, В. А.

doi:10.1103/physrevlett.104.227601

Cited by 83 publications

(66 citation statements)

References 41 publications

(52 reference statements)

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“…coherent growth of the superlattice on STO substrate, KTO subunit is in -2.3 % compressive strain. Note that coherent growth of KTO on STO substrate in experiments is just this case and the strain on KTO is -2.1%, 20,24,33 very close to our theoretical value. When -1.0% strain is imposed to the superlattice, the strain on KTO is -3.3%.…”

Section: Computational Detailssupporting

confidence: 64%

“…This behavior is in accord with strain-induced ferroelectric properties in KTO and STO bulk. 20,35 We thereafter focus mainly on FE superlattices.…”

Section: Resultsmentioning

confidence: 99%

“…35 Moreover, the KTO films with large enough biaxial compressive strain (-2.5% ∼ -1.0%) were proposed to stabilize in FE tetragonal P4mm. 20 The stability of this phase should be enhanced with larger biaxial compressive strain. The initial FE supercells (with P4mm symmetry) were built by using strained bulks with the same strain as the supercells and were optimized until the energy is minimized.…”

Section: Computational Detailsmentioning

confidence: 99%

“…19 KTaO 3 (KTO) films coherent grown on STO also exhibit FE ordering. 20 Furthermore, recent studies have shown that biaxial in-plane strain applied through substrates can influence the conducting properties in LaAO 3 /SrTiO 3 heterostructures. 21 found that in-plane compressive strain on the LaAO 3 /SrTiO 3 heterostructures reduces carrier density of 2DEG.…”

Section: Introductionmentioning

confidence: 99%

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Impact of biaxial compressive strain on the heterostructures of paraelectrics KTaO3 and SrTiO3

2015

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We have performed density functional theory calculations to explore the impact of biaxial compressive strain on the heterostructures of paraelectrics KTaO3 and SrTiO3. We find that the strain induces strong ferroelectric distortion in KTaO3/SrTiO3 heterostructures and it stabilizes the heterostructures in ferroelectric states.The strain influences the distribution of doped holes and leads to the localization of holes in TiO2 layer. It is very interesting that ferroelectricity and ferromagnetism simultaneously present in the strained heterostructures formed by the paraelectrics KTaO3 and SrTiO3. The reversal of ferroelectric polarization changes the interface magnetization and thus results in magnetoelectric coupling effect in the heterostructures.

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Section: Computational Detailssupporting

confidence: 64%

“…This behavior is in accord with strain-induced ferroelectric properties in KTO and STO bulk. 20,35 We thereafter focus mainly on FE superlattices.…”

Section: Resultsmentioning

confidence: 99%

Section: Computational Detailsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of biaxial compressive strain on the heterostructures of paraelectrics KTaO3 and SrTiO3

2015

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“…[1][2][3][4][5][6][7][8] In particular, a new family of materials in which ferroelectric and dielectric constituents are combined in epitaxial superlattices with atomic layer thickness precision has recently been developed. Thin films can be commensurately strained to percent levels without fracture via lattice mismatch strain to an underlying substrate, 7 enabling enhancement of ferroelectric transition temperatures by hundreds of degrees, 7,25 the transformation of materials that are normally never ferroelectric into ferroelectrics, [9][10][11][12] or totally new phenomena to emerge. [13][14][15] Essential to understanding the fundamental relation between strain and polarization in superlattices is the analysis of the associated domain morphology.…”

Section: Introductionmentioning

confidence: 99%

Direct determination of the effect of strain on domain morphology in ferroelectric superlattices with scanning probe microscopy

Kathan-Galipeau

et al. 2012

Journal of Applied Physics

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. (2012). Direct determination of the effect of strain on domain morphology in ferroelectric superlattices with scanning probe microscopy. Journal of Applied Physics, 112(5) AbstractA variant of piezo force microscopy was used to characterize the effect of strain on polarization in [(BaTiO 3 ) n /(SrTiO 3 ) m ] p superlattices. The measurements were compared to theoretical predictions based on phase-field calculations. When polarization is constrained to be perpendicular to the substrate, the measured polarization and domain morphology agree quantitatively with the predictions. This case allows the presence of an internal electric field in the thin film to be identified. The measured trend in piezoelectric response with strain state was in qualitative agreement with predictions, and the differences were consistent with the presence of internal electrical fields. Clear differences in domain morphology with strain were observed; and in some cases, the lateral anisotropic strain appeared to influence the domain morphology. The differences in magnitude and morphology were attributed to the internal electric fields and anisotropic strains. A variant of piezo force microscopy was used to characterize the effect of strain on polarization in [(BaTiO 3 ) n /(SrTiO 3 ) m ] p superlattices. The measurements were compared to theoretical predictions based on phase-field calculations. When polarization is constrained to be perpendicular to the substrate, the measured polarization and domain morphology agree quantitatively with the predictions. This case allows the presence of an internal electric field in the thin film to be identified. The measured trend in piezoelectric response with strain state was in qualitative agreement with predictions, and the differences were consistent with the presence of internal electrical fields. Clear differences in domain morphology with strain were observed; and in some cases, the lateral anisotropic strain appeared to influence the domain morphology. The differences in magnitude and morphology were attributed to the internal electric fields and anisotropic strains. Disciplines Materials Science and Engineering

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Ferroelectric Phase Transitions in Epitaxial Perovskite Films

Tyunina

2016

Nanoscale Ferroelectrics and Multiferroics

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Evidence for Strain-Induced Ferroelectric Order in Epitaxial Thin-FilmKTaO3

Cited by 83 publications

References 41 publications

Impact of biaxial compressive strain on the heterostructures of paraelectrics KTaO3 and SrTiO3

Impact of biaxial compressive strain on the heterostructures of paraelectrics KTaO3 and SrTiO3

Direct determination of the effect of strain on domain morphology in ferroelectric superlattices with scanning probe microscopy

Ferroelectric Phase Transitions in Epitaxial Perovskite Films

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