Thermal and transport properties of manganites Nd1-xSrxMnO3 (x=0.5, 0.45)

被引：4
|
作者：
Gamzatov, A. G.
Allev, A. M.
Abdulvagidov, Sh. B.
Batdalov, A. B.
Gorbenko, O. Y.
Kaul, A. R.
机构：
[1] RAS, Inst Phys, Daghestan Sci Ctr, Makhachkala 367003, Russia
[2] Moscow MV Lomonosov State Univ, Dept Chem, Moscow 119899, Russia
来源：
PHYSICA B-CONDENSED MATTER | 2007年 / 395卷 / 1-2期
基金：
俄罗斯基础研究基金会;
关键词：
manganite; specific heat; thermal diffusivity; thermal conductivity; phonon;
D O I：
10.1016/j.physb.2007.03.011
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The temperature dependencies of the specific heat, thermal diffusivity and thermal conductivity in polycrystalline Nd0.55Sr0.45MnO3 and Nd0.5Sr0.5MnO3 manganites are measured in wide temperature range of 77-300K. These characteristics reveal peculiarities at magnetic phase transition and transition into charge-ordered (CO) state. It is shown that a change of the phonon spectrum due to lattice contraction is the main reason of a sharp decrease of the thermal conductivity in Nd0.5Sr0.5MnO3 at the transition to the antiferromagnetic CO state. Using the experimental thermal diffusivity data and sound velocity data a temperature dependency of the phonon mean free path is calculated. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：151 / 154
页数：4
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