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This article is cited in 3 scientific papers (total in 3 papers)
Soft-mode related origin of the boson peak and acoustic-phonon broadening in glasses
M. I. Klinger Bar-Ilan University, Department of Physics
Abstract:
We study the origin of the boson peak and an associated mechanism for
acoustic-phonon broadening (below the peak) in glasses exhibiting
a high-frequency sound above the peak. The origin is related to the Ioffe–Regel crossover for inelastic (resonant) scattering of
acoustic phonons from harmonic soft-mode vibrations. The broadening mechanism
is due to the resonant interaction of a harmonic soft-mode vibration with
acoustic phonons, which results in the resonant scattering. We find that
the associated width of the phonon is independent of temperature and is
characterized by a power-law frequency dependence with the exponent varying
from $\varkappa=2$ just below the boson peak to $\varkappa=4$ at lower frequencies. The dependences seem to partly agree with some recent experimental data for the glasses under consideration.
Keywords:
boson peak, glass dynamics, soft mode.
Received: 08.05.2007
Citation:
M. I. Klinger, “Soft-mode related origin of the boson peak and acoustic-phonon broadening in glasses”, TMF, 154:1 (2008), 77–90; Theoret. and Math. Phys., 154:1 (2008), 64–74
Linking options:
https://www.mathnet.ru/eng/tmf6152https://doi.org/10.4213/tmf6152 https://www.mathnet.ru/eng/tmf/v154/i1/p77
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Abstract page: | 808 | Full-text PDF : | 318 | References: | 59 | First page: | 22 |
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