COLLECTIVE LOW-FREQUENCY EXCITATIONS IN A MOLECULAR GLASS

被引：17
作者：
BERMEJO, FJ
MARTINEZ, JL
GARCIAHERNANDEZ, M
MARTIN, D
MOMPEAN, FJ
ALONSO, J
HOWELLS, WS
机构：
[1] INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE
[2] RUTHERFORD APPLETON LAB,ISIS PULSED NEUTRON FACIL,DIDCOT OX11 0QX,OXON,ENGLAND
来源：
EUROPHYSICS LETTERS | 1991年 / 15卷 / 05期
关键词：
GLASSES; MOLECULAR LIQUIDS;
D O I：
10.1209/0295-5075/15/5/007
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The excitations below 40 me V of a glass-former mixture (CD3OD 6% D2O) have been studied by neutron spectroscopy. A well-resolved inelastic peak with a dispersion behaviour reminiscent of those found in metallic glasses has been observed for temperatures above 10 K. The presence of such peak is correlated with an abrupt enhancement of the total vibrational density of states (TDOS). The nature of the excitations is analysed by means of their wave vector dependence. Finally, the TDOS are tentatively interpreted in terms of a coupling between sound waves and localized excitations, which becomes effective for temperatures above 10 K.
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页码：509 / 514
页数：6
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