Anomalous behavior of the velocity of hypersonic acoustic phonons in (NH4)3H(SO4)2 crystals

被引：1
作者：
Lushnikov, SG [1 ]
Fedoseev, AI
Shuvalov, LA
Schmidt, H
机构：
[1] Russian Acad Sci, AF Ioffe Physicotech Inst, St Petersburg 194021, Russia
[2] Russian Acad Sci, AV Shubnikov Crystallog Inst, Moscow 117333, Russia
[3] Montana State Univ, Bozeman, MT 59717 USA
来源：
JETP LETTERS | 2003年 / 78卷 / 02期
基金：
美国国家科学基金会; 俄罗斯基础研究基金会;
关键词：
D O I：
10.1134/1.1615535
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The velocity of quasi-longitudinal acoustic (QLA) phonons in (NH4)(3)H(SO4)(2) (TAHS) crystals was studied by Brillouin scattering in the temperature range from 295 to 430 K. It was found that the QLA phonon velocity in the vicinity of a superionic ferroelastic phase transition (T-c = 413 K) exhibits anomalous temperature dependence. At T < T-c, an additional contribution is separated from the temperature dependence of the hypersound velocity, the behavior of which is correlated with variations of the conductivity of a TAHS crystal. Based on an analysis of the experimental data, a thermoactivation mechanism explaining the anomalous behavior of the QLA phonon velocity is proposed and the corresponding activation energy is estimated. (C) 2003 MAIK "Nauka / Interperiodica".
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页码：84 / 87
页数：4
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