Scaling the Temperature-Dependent Boson Peak of Vitreous Silica with the High-Frequency Bulk Modulus Derived from Brillouin Scattering Data

被引：49

作者：

Ruffle, B. ^{[1
]}

Ayrinhac, S. ^{[1
]}

Courtens, E. ^{[1
]}

Vacher, R. ^{[1
]}

Foret, M. ^{[1
]}

Wischnewski, A. ^{[2
]}

Buchenau, U. ^{[2
]}

机构：

[1] Univ Montpellier 2, CNRS, UMR 5587, Lab Colloides Verres & Nanomat, F-34095 Montpellier 5, France

[2] Forschungszentrum Julich, Inst Festkorperforsch, D-52425 Julich, Germany

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 06期

关键词：

QUASI-ELASTIC SCATTERING; STRUCTURAL RELAXATION; POTENTIAL MODEL; GLASS FORMERS; RAMAN; ABSORPTION; ANOMALIES;

D O I：

10.1103/PhysRevLett.104.067402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The position and strength of the boson peak in silica glass vary considerably with temperature T. Such variations cannot be explained solely with changes in the Debye energy. New Brillouin-scattering measurements are presented which allow determining the T dependence of unrelaxed acoustic velocities. Using a velocity based on the bulk modulus, scaling exponents are found which agree with the soft-potential model. The unrelaxed bulk modulus thus appears to be a good measure for the structural evolution of silica with T and to set the energy scale for the soft potentials.

引用

页数：4

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