Journal Article

PreJuSER-44245

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Pressure dependence of the boson peak in glasses

Gurevich, V. L. ; Parshin, D. A. ; Schober, H. R.FZJ*

2005
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/1578  doi:10.1103/PhysRevB.71.014209

Abstract: The inelastic scattering intensities of glasses and amorphous materials have a maximum at a low frequency, the so-called boson peak. Under applied hydrostatic pressure P, the boson peak frequency omega(b) is shifted upward. We have shown previously that the boson peak is created as a result of a vibrational instability due to the interaction of harmonic quasilocalized vibrations (QLV). By applying pressure one exerts forces on the QLV. These shift the low frequency part of the excess spectrum to higher frequencies. For low pressures we find a shift of the boson peak linear in P, whereas for high pressures the shift is proportional toP(1/3). Our analytics is supported by simulation. The results are in agreement with the existing experiments.

Keyword(s): J

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Theorie III (IFF-TH-III)

Research Program(s):

1. Kondensierte Materie (M02)

Appears in the scientific report 2005
Notes: This version is available at the following Publisher URL: http://prb.aps.org

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