Phonon scattering and stability of Na0.5CoO2

被引：7
|
作者：
Zhang, XN
Lemmens, P
Gnezdilov, V
Choi, KY
Keimer, B
Chen, DP
Lin, CT
Chou, FC
机构：
[1] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany
[2] BI Verkin Inst Low Temp Phys, UA-61164 Kharkov, Ukraine
[3] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
[4] MIT, Ctr Mat Sci & Engn, Cambridge, MA 02139 USA
来源：
PHYSICA B-CONDENSED MATTER | 2005年 / 359卷
关键词：
cobaltates; Raman scattering; charge ordering;
D O I：
10.1016/j.physb.2005.01.085
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Raman scattering experiments have been performed on NaxCoO2 as a function of temperature at the composition x = 0.5 where a structural instability and a metal-insulator transition have been observed. Three additional phonon modes are observed compared to samples with larger x. An in situ annealing study (T-max = 550 K) with the initial presence of water vapor at ambient conditions reveals an irreversible structural instability of this composition. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码：424 / 426
页数：3
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