Neutron Brillouin and umklapp scattering from glassy selenium

被引：31

作者：

Foret, M ^{[1
]}

Hehlen, B

Taillades, G

Courtens, E

Vacher, R

Casalta, H

Dorner, B

机构：

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

[2] Univ Montpellier 2, Lab Physicochim Mat Condensee, CNRS, UMR 5617, F-34095 Montpellier, France

[3] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 81卷 / 10期

关键词：

D O I：

10.1103/PhysRevLett.81.2100

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Scattering from high-frequency acoustic modes is measured in glassy Se using two neutron spectrometries. Both Brillouin scattering under kinematic conditions and the boson peak are observed. Owing to an absolute calibration, the strengths of the various contributions can be compared to each other and to theory. Umklapp scattering via the static structure factor provides unique information on transverse acoustic modes. It shows that all acoustic excitations cease to propagate beyond similar to 5 meV.

引用

页码：2100 / 2103

页数：4

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