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

被引：6

作者：

Schulte, A. ^{[1
,2
]}

Schirmacher, W. ^{[3
,4
]}

Schmid, B. ^{[3
]}

Unruh, T. ^{[5
,6
]}

机构：

[1] Univ Cent Florida, Dept Phys, Cent Florida Blvd, Orlando, FL 32816 USA

[2] Univ Cent Florida, Coll Opt & Photon, Orlando, FL 32816 USA

[3] Johannes Gutenberg Univ Mainz, Inst Phys, D-55099 Mainz, Germany

[4] Tech Univ Munich, Phys Dept E13, D-85747 Garching, Germany

[5] Tech Univ Munich, Neutronenquelle Heinz Maier Leibnitz FRM II, D-85747 Garching, Germany

[6] Univ Erlangen Nurnberg, Lehrstuhl Kristallog & Strukturphys, D-91058 Erlangen, Germany

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2011年 / 23卷 / 25期

关键词：

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

D O I：

10.1088/0953-8984/23/25/254212

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

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.

引用

页数：6

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