Dispersion of Phonons and Their Pressure Behavior in Model Ferroelastic Hg2I2

被引：1
|
作者：
Roginskii, E. M. [1 ]
Kvasov, A. A. [2 ]
Markov, Yu. F. [1 ]
Smirnov, M. B. [3 ]
机构：
[1] Russian Acad Sci, Ioffe Physicotech Inst, St Petersburg 194021, Russia
[2] Univ Lausanne, CH-1015 Lausanne, Switzerland
[3] St Petersburg State Univ, St Petersburg 199034, Russia
来源：
FERROELECTRICS | 2013年 / 444卷 / 01期
基金：
俄罗斯基础研究基金会;
关键词：
ferroelastics; phase transitions; dispersion branches;
D O I：
10.1080/00150193.2013.785893
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The dispersion dependences of the frequencies of acoustic and optical phonons are calculated and constructed, and the density of states of the phonon spectrum is obtained for Hg2I2 crystals. The influence of the hydrostatic pressure on the frequencies of acoustic and optical phonons and their dispersion is analyzed theoretically. It is revealed that an increase in the pressure leads to a considerable softening of the slowest acoustic TA-branch (soft mode) at the X-point of the Brillouin zone boundary.
引用
收藏
页码：33 / 39
页数：7
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