Pressure dependence of the Boson peak in glasses

Details Pressure dependence of the Boson peak in glasses Pressure dependence of the Boson peak in glasses

2004-07-21

arxiv.org/abs/cond-mat/0407565v1

Phys. Rev. B 71, 014209 (2005)

Physics

Condensed Matter

Disordered Systems and Neural Networks

9 pages, 8 figures

Scientific paper

10.1103/PhysRevB.71.014209

The inelastic scattering intensities of glasses and amorphous materials has a maximum at a low frequency, the so called Boson peak. Under applied hydrostatic pressure, $P$, the Boson peak frequency, $\omega_{\rm b}$, is shifted upwards. We have shown previously that the Boson peak is created as a result of a vibrational instability due to the interaction of harmonic quasi localized vibrations (QLV). 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 $\propto P^{1/3}$. Our analytics is supported by simulation. The results are in agreement with the existing experiments.

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