Raman Scattering on the Effective Soft Mode for Lithium Niobate Crystals

Горелик, В. С.; Pyatyshev, A. Yu.

doi:10.3103/s1062873818030097

Cited by 6 publications

(3 citation statements)

References 13 publications

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“…Previously, a method was proposed that relies on recording isowavenumber temperature dependencies of Raman scattering spectral intensity I (Ω, T ) (Ω = ω 0 − ω′ = const). In this case, the spectral position at the exit slit of Raman spectrometer is fixed at ω ′ = ω 0 − Ω near the exciting line of wavenumber ω 0 .…”

Section: Experimental Isowavenumber Dependencies Of Raman Spectra In mentioning

confidence: 99%

Raman scattering from the effective soft mode in lead germanate crystal

Горелик

Pyatyshev

2020

J Raman Spectroscopy

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The Raman opalescence of an effective soft mode in crystalline lead germanate is investigated. Recording of Raman scattering intensity was in the x (zz)y geometry corresponding to the soft mode, responsible for ferroelectric phase transition point at 451 K. The Raman spectra were measured at fixed temperatures T (I(ω′, T); T = const) and also at fixed wavenumbers ω′ of Raman spectrometer (I(ω′, T); ω′ = ω0 – Ω = const) with slow temperature changing. The strong increase of Raman scattering intensity (Raman opalescence) has been observed at temperatures of phase transition region. The appearance of central peak scattering is attributed to the strong interaction of the effective soft mode with a low‐wavenumber nonfundamental oscillator.

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Section: Experimental Isowavenumber Dependencies Of Raman Spectra In mentioning

confidence: 99%

Raman scattering from the effective soft mode in lead germanate crystal

Горелик

Pyatyshev

2020

J Raman Spectroscopy

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“…Earlier, the method was proposed, which relies on recording temperature dependencies of isofrequency Raman scattering spectral intensity I(Ω,T) (Ω=ω 0 ‐ω′=const). In this case, the spectral position at the exit slit of Raman spectrometer is fixed at ω′=ω 0 ‐Ω near the exciting line of frequency ω 0 .…”

Section: Experimental Isofrequency Dependencies Of Raman Spectra In Cmentioning

confidence: 99%

Raman opalescence of a destabilizing soft mode near the phase transition in quartz monocrystals

Горелик

Pyatyshev²

2019

J Raman Spectroscopy

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A microscopic reason of the opalescence phenomenon observed earlier near the α–β phase transition point at 846 K in crystalline quartz is established. It was shown that the opalescence in quartz crystals is of dynamic nature and results from a sharp increase of Raman scattering spectral intensity (Raman opalescence phenomenon) due to huge fluctuations of the destabilizing soft mode responsible for instability of the crystalline lattice. The Raman opalescence of a destabilizing soft mode is estimated experimentally in the x (zz)y light scattering geometry by recording temperature dependencies of spectral Raman intensity I(ω′,T) (ω′=ω0‐Ω=const) at fixed frequencies ω′. The strong intensity increase of Raman scattering intensity (Raman opalescence) observed at the exact phase‐transition temperature in crystalline quartz is explained by taking into account interaction of the destabilizing soft mode with a low‐frequency high‐finesse oscillator.

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“…Besides, so-called central peak, corresponding to a sharp spectral intensity increase in light, slow neutron, and X-ray scattering in the region of structural phase transitions, was detected in several crystals: Nb3Sn, SrTiO3, KMnF3, KNbO3, Pb5Ge3O11 and others. Today numerous works [3][4][5][6][7][8] are devoted to the investigations of light scattering laws near the phase transition points in condensed media. In this paper, we present an experimental and theoretical investigation of Raman scattering intensity sharp increase, named as Raman opalescence, for some crystals near the phase transition point.…”

mentioning

confidence: 99%

Raman Scattering on the Effective Soft Mode for Lithium Niobate Crystals

Cited by 6 publications

References 13 publications

Raman scattering from the effective soft mode in lead germanate crystal

Raman scattering from the effective soft mode in lead germanate crystal

Raman opalescence of a destabilizing soft mode near the phase transition in quartz monocrystals

Raman opalescence and central peak scattering near phase transition point in crystals

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