Frequency behavior of Raman coupling coefficient in glasses

Суровцев, Н. В.; Sokolov, Alexei P.

doi:10.1103/physrevb.66.054205

Cited by 83 publications

(98 citation statements)

References 51 publications

(84 reference statements)

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“…Therefore, in order to evaluate the interaction between light and materials in the vicinity of the BP frequency, it is crucial to understand the light-vibration coupling coefficients [7,24,48,76]. Figure 4(a) shows C IR (ν) and C Raman (ν) of the vitreous glucose at room temperature obtained using Eqs.…”

Section: Relative Light-vibration Coupling Coefficientmentioning

confidence: 99%

“…This model was evaluated for several oxide glasses using THz-TDS [7,78]; however, systematic investigations for various glasses have not yet been done. On the other hand, C Raman (ν) in the vicinity of the BP frequency has been well investigated by both experimental and theoretical approaches [24,34,76,79]. Surovtsev and Sokolov [24] empirically classified C Raman (ν) into two categories: type I is C Raman (ν) = A (ν + 0.5ν BP−VDOS ), and type II is C Raman (ν) = A ν, where A and A are constants.…”

Section: Relative Light-vibration Coupling Coefficientmentioning

confidence: 99%

“…In this context, we attempted to calculate C IR (ν) = α(ν)/[νχ (ν)]C Raman (ν) assuming the specific form of C Raman (ν) = A (ν + 0.5ν BP−VDOS ) [24], and the results are shown in Fig. 4(c).…”

Section: Relative Light-vibration Coupling Coefficientmentioning

confidence: 99%

“…As experimental studies, INS [11][12][13][14][15][16] and IXS [17][18][19] are the most powerful methods, and an acoustic phononlike behavior and flattened dispersion curves have been observed in many glasses [13][14][15][16]. Meanwhile, the LFRS technique can easily access the BP of not only inorganic glasses but also organic glass formers due to the unnecessary deuteration [20][21][22][23][24]. Regarding the thermal properties, the low-temperature specific heat C p [20,[25][26][27] shows the BP in C p /T 3 , and the thermal conductivity shows a plateau in the corresponding temperature region [20,25].…”

Section: Introductionmentioning

confidence: 99%

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Boson peak dynamics of glassy glucose studied by integrated terahertz-band spectroscopy

et al. 2016

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We performed terahertz time-domain spectroscopy, low-frequency Raman scattering, and Brillouin light scattering on vitreous glucose to investigate the boson peak (BP) dynamics. In the spectra of α(ν)/ν 2 [α(ν) is the absorption coefficient], the BP is clearly observed around 1.1 THz. Correspondingly, the complex dielectric constant spectra show a universal resonancelike behavior only below the BP frequency. As an analytical scheme, we propose the relative light-vibration coupling coefficient (RCC), which is obtainable from the combination of the far-infrared and Raman spectra. The RCC reveals that the infrared light-vibration coupling coefficient C IR (ν) of the vitreous glucose behaves linearly on frequency which deviates from Taraskin

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Section: Relative Light-vibration Coupling Coefficientmentioning

confidence: 99%

Section: Relative Light-vibration Coupling Coefficientmentioning

confidence: 99%

Section: Relative Light-vibration Coupling Coefficientmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Boson peak dynamics of glassy glucose studied by integrated terahertz-band spectroscopy

et al. 2016

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“…The coupling factors c i,s , originally assumed to be constant, turned out to have a rather complicated energy dependence 6,7 . The factor ω −1 is separated out of the coupling factor as the most probable energy dependence due to the matrix elements of the harmonic oscillators.…”

Section: Introductionmentioning

confidence: 99%

Light scattering study of low-energy vibrational excitations in the metallic glass Ni67Zr33using electronic Raman scattering

et al. 2011

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The Raman response of the metallic glass Ni67Zr33 is measured as a function of polarization and temperature and analyzed theoretically. Unexpectedly, the intensity in the range up to 300 cm −1 increases upon cooling, which is counterintuitive when the response originates from vibrations alone as in insulators. The increase finds a natural explanation if the conduction electrons are assumed to scatter on localized vibrations with a scattering probability proportional to the Debye-Waller factor. None of our assumptions is material specific, and the results are expected to be relevant for disordered systems in general.

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Local Deformation of Glasses is Mediated by Rigidity Fluctuation on Nanometer Scale

et al. 2018

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Microscopic deformation processes determine defect formation on glass surfaces and, thus, the material's resistance to mechanical failure. While the macroscopic strength of most glasses is not directly dependent on material composition, local deformation and flaw initiation are strongly affected by chemistry and atomic arrangement. Aside from empirical insight, however, the structural origin of the fundamental deformation modes remains largely unknown. Experimental methods that probe parameters on short or intermediate length‐scale such as atom–atom or superstructural correlations are typically applied in the absence of alternatives. Drawing on recent experimental advances, spatially resolved Raman spectroscopy is now used in the THz‐gap for mapping local changes in the low‐frequency vibrational density of states. From direct observation of deformation‐induced variations on the characteristic length‐scale of molecular heterogeneity, it is revealed that rigidity fluctuation mediates the deformation process of inorganic glasses. Molecular field approximations, which are based solely on the observation of short‐range (interatomic) interactions, fail in the prediction of mechanical behavior. Instead, glasses appear to respond to local mechanical contact in a way that is similar to that of granular media with high intergranular cohesion.

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Frequency behavior of Raman coupling coefficient in glasses

Cited by 83 publications

References 51 publications

Boson peak dynamics of glassy glucose studied by integrated terahertz-band spectroscopy

Boson peak dynamics of glassy glucose studied by integrated terahertz-band spectroscopy

Light scattering study of low-energy vibrational excitations in the metallic glass Ni67Zr33using electronic Raman scattering

Local Deformation of Glasses is Mediated by Rigidity Fluctuation on Nanometer Scale

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