On the role of quasi-localized soft-mode vibrations in the boson peak and quasi-elastic scattering in glasses

M. I. Klinger; V. Halpern

doi:10.1016/s0375-9601(99)00246-7

On the role of quasi-localized soft-mode vibrations in the boson peak and quasi-elastic scattering in glasses

M. I. Klinger
, V. Halpern

Department of Physics - at Bar-Ilan University

Bar-Ilan University

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

It is argued that the contribution of quasi-localized ID soft-mode vibrational excitations to the photon (neutron) quasi-elastic scattering (QES) correlated with the boson peak in glasses can be considerable, as well as the earlier revealed contribution of acoustic phonons is. The main points are that only anharmonic coupling of the 1D soft mode with acoustic modes can give rise to this kind of QES and, at least for direct cubic anharmonic coupling, the coupling coefficient in a glass is finite.

Original language	English
Pages (from-to)	379-385
Number of pages	7
Journal	Physics Letters, Section A: General, Atomic and Solid State Physics
Volume	256
Issue number	5-6
DOIs	https://doi.org/10.1016/s0375-9601(99)00246-7
State	Published - 14 Jun 1999

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N2 - It is argued that the contribution of quasi-localized ID soft-mode vibrational excitations to the photon (neutron) quasi-elastic scattering (QES) correlated with the boson peak in glasses can be considerable, as well as the earlier revealed contribution of acoustic phonons is. The main points are that only anharmonic coupling of the 1D soft mode with acoustic modes can give rise to this kind of QES and, at least for direct cubic anharmonic coupling, the coupling coefficient in a glass is finite.

AB - It is argued that the contribution of quasi-localized ID soft-mode vibrational excitations to the photon (neutron) quasi-elastic scattering (QES) correlated with the boson peak in glasses can be considerable, as well as the earlier revealed contribution of acoustic phonons is. The main points are that only anharmonic coupling of the 1D soft mode with acoustic modes can give rise to this kind of QES and, at least for direct cubic anharmonic coupling, the coupling coefficient in a glass is finite.

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On the role of quasi-localized soft-mode vibrations in the boson peak and quasi-elastic scattering in glasses

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