Frequency behavior of Raman coupling coefficient in glasses

N. V. Surovtsev; A. P. Sokolov

doi:10.1103/PhysRevB.66.054205

Frequency behavior of Raman coupling coefficient in glasses

N. V. Surovtsev, A. P. Sokolov

RAS - Institute of Automation and Electrometry, Siberian Branch

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82 Scopus citations

Abstract

The low-frequency Raman coupling coefficient C(v) of 11 different glasses is evaluated. It is shown that the coupling coefficient demonstrates a universal linear frequency behavior C(v)∞(v/v_BP+B) near the boson peak maximum v_BP. The frequency dependence of C(v) allows us to separate the glasses studied into two groups: the first group has a frequency independent contribution B∼0.5, while the second one has B∼0. It was found that C(v) demonstrates a superlinear behavior at very low frequencies. This observation suggests a vanishing of the coupling coefficient when frequency tends to zero.

Original language	English
Article number	054205
Pages (from-to)	542051-542056
Number of pages	6
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	66
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevB.66.054205
State	Published - Aug 1 2002
Externally published	Yes

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abstract = "The low-frequency Raman coupling coefficient C(v) of 11 different glasses is evaluated. It is shown that the coupling coefficient demonstrates a universal linear frequency behavior C(v)∞(v/vBP+B) near the boson peak maximum vBP. The frequency dependence of C(v) allows us to separate the glasses studied into two groups: the first group has a frequency independent contribution B∼0.5, while the second one has B∼0. It was found that C(v) demonstrates a superlinear behavior at very low frequencies. This observation suggests a vanishing of the coupling coefficient when frequency tends to zero.",

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AB - The low-frequency Raman coupling coefficient C(v) of 11 different glasses is evaluated. It is shown that the coupling coefficient demonstrates a universal linear frequency behavior C(v)∞(v/vBP+B) near the boson peak maximum vBP. The frequency dependence of C(v) allows us to separate the glasses studied into two groups: the first group has a frequency independent contribution B∼0.5, while the second one has B∼0. It was found that C(v) demonstrates a superlinear behavior at very low frequencies. This observation suggests a vanishing of the coupling coefficient when frequency tends to zero.

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Frequency behavior of Raman coupling coefficient in glasses

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