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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