COLLECTIVE EXCITATIONS IN THE ANHARMONIC CRYSTAL

被引：1
|
作者：
VERBEURE, A
ZAGREBNOV, VA
机构：
[1] UNIV AIX MARSEILLE 2,DEPT PHYS,F-13288 MARSEILLE 9,FRANCE
[2] CNRS,CTR PHYS THEOR,F-13288 MARSEILLE 9,FRANCE
来源：
PHYSICA A | 1995年 / 215卷 / 03期
关键词：
D O I：
10.1016/0378-4371(94)00260-Z
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We consider a lattice model of an anharmonic crystal and compute the isothermal (chi(T)) and adiabatic (chi(S)) susceptibilities for the lattice displacement below T-c. A detailed analysis is given in terms of the dimension of the lattice and a decay parameter of the harmonic force. It turns out that there is a phase-space region for which 0 < chi(T)/chi(S) < 1, indicating breaking of ergodicity, and a region for which chi(T) is finite, indicating the presence of a plasmon frequency due to the anharmonicity.
引用
收藏
页码：394 / 404
页数：11
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