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Volumn 79, Issue 4, 2009, Pages

Dipole-active optical phonons in YTiO3: Ellipsometry study and lattice-dynamics calculations

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EID: 59749096295     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.79.045114     Document Type: Article
Times cited : (24)

References (64)
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    • To extract information about the phonons we fitted the ellipsometry spectra in Figs. 2 3 4 using a simple Lorentz model for noninteracting harmonic oscillators. However, as one can see from Figs. 2 3 4, several phonon bands show weak asymmetry, with flatter rise and steeper fall of the imaginary part of ε(ω). At the same time the -1/ε(ω) spectra were found to be fitted fairly well with a Lorentz model. The asymmetry of optical phonon modes suggests mode coupling and interaction damping, which can be accounted for by a phenomenological model for coupled oscillators, ε(ω) = ε + εj Sj ωj2 -iω σj ωj2 - ω2 -iω γj, with the asymmetry parameters σj (Ref.). We estimate that the level of asymmetry of all TO phonons in YTiO3 is fairly weak and within the experimental uncertainties in our case.
    • To extract information about the phonons we fitted the ellipsometry spectra in Figs. 2 3 4 using a simple Lorentz model for noninteracting harmonic oscillators. However, as one can see from Figs. 2 3 4, several phonon bands show weak asymmetry, with flatter rise and steeper fall of the imaginary part of ε (ω). At the same time the -1/ε(ω) spectra were found to be fitted fairly well with a Lorentz model. The asymmetry of optical phonon modes suggests mode coupling and interaction damping, which can be accounted for by a phenomenological model for coupled oscillators, ε(ω) = ε + εj Sj ωj2 -iω σj ωj2 - ω2 -iω γj, with the asymmetry parameters σj (Ref.). We estimate that the level of asymmetry of all TO phonons in YTiO3 is fairly weak and within the experimental uncertainties in our case.
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