Thermally activated two-level systems in superionic conductors

被引：5
作者：
Abdulchalikova, NR [1 ]
Aliev, AE [1 ]
Krivorotov, VF [1 ]
Khabibullaev, PK [1 ]
机构：
[1] Uzbek Acad Sci, Heat Phys Dept, Tashkent 700135, Uzbekistan
来源：
SOLID STATE IONICS | 1998年 / 107卷 / 1-2期
关键词：
superionic conductors; heat capacity; thermal conductivity; two-level systems;
D O I：
10.1016/S0167-2738(97)00395-0
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In superionic crystals, as well as in vitreous superionic conductors, the monotonous growth (almost linear) of the specific heat C(T) and the thermal conductivity lambda(T) in a wide temperature range of superionic phase has been obtained. Such behaviour takes place in a temperature region that considerably exceeds the Debye temperatures of the investigated materials. It is shown that in the high temperature region the growth of C, and respectively lambda, may reflect a relaxation interaction of high frequency phonons with two-level systems (TLS). The examination of excess heat capacity Delta C(T) in the framework of the TLS model allows to find a concentration of migration ions, which is in good accordance with an experimental data.
引用
收藏
页码：59 / 65
页数：7
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