Title

Inelastic neutron and low-frequency Raman scattering in niobium-phosphate glasses: the role of spatially fluctuating elastic and elasto-optic constants

Authors

Authors

A. Schulte; W. Schirmacher; B. Schmid;T. Unruh

Comments

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Abbreviated Journal Title

J. Phys.-Condes. Matter

Keywords

BOSON PEAK; VIBRATIONAL EXCITATIONS; THERMAL-CONDUCTIVITY; COUPLING; COEFFICIENT; AMORPHOUS SOLIDS; LIGHT-SCATTERING; VITREOUS SILICA; STATES; DENSITY; DISORDER; Physics, Condensed Matter

Abstract

We investigate the low-frequency enhancement of vibrational excitations ('boson peak') in niobium-phosphate glasses through the combination of inelastic neutron and polarization-resolved Raman scattering. The spectra of these glasses reveal an enhancement of the vibrational density of states and of the cross section for spontaneous Raman scattering in the frequency range below 150 cm(-1). A recent theoretical model that is based on fluctuating elastic and elasto-optic (Pockels) constants provides a unified description of the measured neutron and Raman spectra, including the depolarization ratio.

Journal Title

Journal of Physics-Condensed Matter

Volume

23

Issue/Number

25

Publication Date

1-1-2011

Document Type

Article

DOI Link

http://dx.doi.org/10.1088/0953-8984/23/25/254212

Language

English

First Page

6

WOS Identifier

WOS:000291433000015

ISSN

0953-8984

Recommended Citation

"Inelastic neutron and low-frequency Raman scattering in niobium-phosphate glasses: the role of spatially fluctuating elastic and elasto-optic constants" (2011). Faculty Bibliography 2010s. 1874.
https://stars.library.ucf.edu/facultybib2010/1874