LOW-ENERGY EXCITATIONS AND HYPERSONIC PROPERTIES AT LOW-TEMPERATURES IN AMORPHOUS MEDIA

被引：9

作者：

PELOUS, J ^{[1
]}

VACHER, R ^{[1
]}

机构：

[1] UNIV MONTPELLIER 2,SPECTROMETRIE RAYLEIGH BRILLOUIN LAB,CNRS EQUIPE RECH 460,F-34060 MONTPELLIER,FRANCE

来源：

JOURNAL DE PHYSIQUE | 1977年 / 38卷 / 09期

关键词：

ACOUSTIC VARIABLES MEASUREMENT - Wave Velocity - ACOUSTICS - Mathematical Models - SILICATES - Low Temperature Effects;

D O I：

10.1051/jphys:019770038090115300

中图分类号：

学科分类号：

摘要：

Brillouin scattering measurements of velocity and inverse mean free path of phonons are presented for three silicate glasses and two samples of PMMA, in the temperature range from 1. 7 to 15 K. The velocity maximum due to resonant absorption of phonons is observed in the silicate glasses for longitudinal phonons of frequency 35 GHz. These experimental results, as well as the measurements of the inverse mean free path, can be described satisfactorily by a model assuming an interaction between phonons and two level systems. In PMMA, the velocity of 18 GHz phonons tends to be constant below 5 K, while the inverse mean free path is proportional to temperature in the whole temperature range. These results can be considered as an evidence of a relaxation process, even if a quantitative description is not possible on the basis of these data only.

引用

页码：1153 / 1159

页数：7

共 31 条

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