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- W1998323485 abstract "An overview is given on the present status of the theoretical description of vibrational spectra of glasses, as seen by inelastic neutron, X-ray and light (Raman) scattering. Using the language of Green's/response functions the merits and shortcomings of a local oscillator and a generalized elasticity-theory point of view are discussed. It is pointed out that in both cases the interaction of phonons with disorder-induced irregularities leads to Rayleigh scattering (mean free path ℓ ∝ ω− 4) at low enough frequencies and temperatures. In disordered solids at ambient temperature the Rayleigh scattering is usually masqued by Akhiezer-like anharmonic scattering ℓ ∝ ω− 2, but it can be made visible by lowering the temperature. Using a combination of fluctuating-elasticity theory with an incoherent spectrum of local oscillators a fair description of the vibrational spectrum of glassy SiO2 can be achieved." @default.
- W1998323485 created "2016-06-24" @default.
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- W1998323485 date "2011-01-01" @default.
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- W1998323485 title "Some comments on fluctuating-elasticity and local oscillator models for anomalous vibrational excitations in glasses" @default.
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- W1998323485 doi "https://doi.org/10.1016/j.jnoncrysol.2010.07.052" @default.
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