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

    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

    Language

    English

    First Page

    6

    WOS Identifier

    WOS:000291433000015

    ISSN

    0953-8984

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