Phonon Raman scattering of perovskite LaNiO3 thin films

Chaban, N.; Weber, Mads C.; Pignard, S.; Kreisel, J.

doi:10.1063/1.3464958

Cited by 58 publications

(59 citation statements)

References 34 publications

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“…According to group theory, the rhombohedral R3c bulk crystal structure of LNO gives rise to five Raman-active modes Raman = A 1g + 4E g . The different lattice normal modes have been calculated by Gou et al [30] and are in agreement with earlier published experimental Raman spectra [31]. Figure 4 presents Raman spectra for seven films: Three of them under compressive strain (14,35, and 130 nm, LNO/LAO), three under tensile strain (14,35, and 130 nm, LNO/LSAT), and for comparison, a spectrum of a strain-free polycrystalline LNO film on a Si substrate (taken from Ref.…”

Section: Raman Scatteringsupporting

confidence: 70%

“…Figure 4 presents Raman spectra for seven films: Three of them under compressive strain (14,35, and 130 nm, LNO/LAO), three under tensile strain (14,35, and 130 nm, LNO/LSAT), and for comparison, a spectrum of a strain-free polycrystalline LNO film on a Si substrate (taken from Ref. [31]). All Raman spectra are well defined, remarkably even for the very thin 14 nm films.…”

Section: Raman Scatteringmentioning

confidence: 99%

“…According to an earlier experimental [31] and theoretical [30] assignment, the vibrational pattern of the E g mode at 156 cm −1 in rhombohedral LNO corresponds to pure La vibrations in the hexagonal (001) plane along the a and b axes. It splits in both the tensile (not so visible in the 35 and 14 nm cases) and compressive states, indicating a symmetry lowering for the La vibrations.…”

Section: Raman Scatteringmentioning

confidence: 99%

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Multiple strain-induced phase transitions inLaNiO3thin films

et al. 2016

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Strain effects on epitaxial thin films of LaNiO 3 grown on different single crystalline substrates are studied by Raman scattering and first-principles simulation. New Raman modes, not present in bulk or fully relaxed films, appear under both compressive and tensile strains, indicating symmetry reductions. Interestingly, the Raman spectra and the underlying crystal symmetry for tensile and compressively strained films are different. Extensive mapping of LaNiO 3 phase stability is addressed by simulations, showing that a variety of crystalline phases are indeed stabilized under strain. The calculated Raman frequencies reproduce the principal features of the experimental spectra, supporting the validity of the multiple strain-driven structural transitions predicted by the simulations.

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Section: Raman Scatteringsupporting

confidence: 70%

Section: Raman Scatteringmentioning

confidence: 99%

Section: Raman Scatteringmentioning

confidence: 99%

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Multiple strain-induced phase transitions inLaNiO3thin films

et al. 2016

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“…63 In this section, we show how the structural transition to the rhombohedrally distorted perovskite phase is characterized by a specific soft mode which has a frequency that collapses to zero as the system approaches the cubic phase. 37 We note that all results in this section are obtained with the LSDA XC-functional and NC-pseudopotentials as implemented in QE.…”

Section: A Structural Phase Transitionmentioning

confidence: 99%

Lattice normal modes and electronic properties of the correlated metal LaNiO3

et al. 2011

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We use density functional theory (DFT) calculations to study the lattice vibrations and electronic properties of the correlated metal LaNiO3. To characterize the rhombohedral to cubic structural phase transition of perovskite LaNiO3, we examine the evolution of the Raman-active phonon modes with temperature. We find that the A1g Raman mode, whose frequency is sensitive to the electronic band structure, is a useful signature to characterize the octahedral rotations in rhombohedral LaNiO3. We also study the importance of electron-electron correlation effects on the electronic structure with two approaches which go beyond the conventional band theory (local spin density approximation): the local spin density+Hubbard U method (LSDA+U ) and hybrid exchange-correlation density functionals which include portions of exact Fock-exchange. We find the conventional LSDA accurately reproduces the delocalized nature of the valence states in LaNiO3 and gives the best agreement to the available experimental data on the electronic structure of LaNiO3. Based on our calculations, we show that the electronic screening effect from the delocalized Ni 3d and O-2p states mitigate the electronic correlations of the d 7 Ni cations, making LaNiO3 a weakly correlated metal.

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“…5,8,9 In this study we present an investigation of BiFeO 3 -CoFe 2 O 4 (BFO-CFO) nanostructures by Raman scattering, which has shown to be a versatile probe for investigating structural properties in thin oxide films. [10][11][12][13][14][15] Most Raman scattering studies of composite-type thin films in the literature concern thin film superlattices. [16][17][18][19] Micro-Raman spectra were recorded using a 488.0 nm laser line through a LabRam…”

Section: /9mentioning

confidence: 99%

Strain analysis of multiferroic BiFeO3-CoFe2O4 nanostructures by Raman scattering

Chaix‐Pluchery

Cochard

Jadhav

et al. 2011

Applied Physics Letters

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We report a Raman scattering investigation of columnar BiFeO 3 -CoFe 2 O 4 (BFO-CFO) epitaxial thin film nanostructures, where BFO pillars are embedded in a CFO matrix. The feasibility of a strain analysis is illustrated through an investigation of two nanostructures with different BFO-CFO ratios. We show that the CFO matrix presents the same strain state in both nanostructures, while the strain state of the BFO pillars depends on the BFO/CFO ratio with an increasing tensile strain along the out-of-plane direction with decreasing BFO content.Our results demonstrate that Raman scattering allows monitoring strain states in complex 3D multiferroic pillar/matrix composites.

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Phonon Raman scattering of perovskite LaNiO3 thin films

Cited by 58 publications

References 34 publications

Multiple strain-induced phase transitions inLaNiO3thin films

Multiple strain-induced phase transitions inLaNiO3thin films

Lattice normal modes and electronic properties of the correlated metal LaNiO3

Strain analysis of multiferroic BiFeO3-CoFe2O4 nanostructures by Raman scattering

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