Oxygen stoichiometry in Sr3Mn2O7-δ:: A Raman scattering investigation

被引：2

作者：

Guedes, I ^{[1
]}

Mitchell, JF ^{[1
]}

Argyriou, D ^{[1
]}

Grimsditch, M ^{[1
]}

机构：

[1] Argonne Natl Lab, Div Sci Mat, Argonne, IL 60439 USA

来源：

PHYSICAL REVIEW B | 2000年 / 62卷 / 21期

关键词：

D O I：

10.1103/PhysRevB.62.13809

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Polycrystalline Sr3Mn2O6.5 and Sr3Mn2O7 layered manganites were studied at room temperature using Raman spectroscopy. While the phonon spectrum of the stoichiometric Sr3Mn2O7 sample is consistent with the group theoretical analysis for the 14/mmm structure, additional features are observed in the phonon spectrum of the oxygen deficient Sr3Mn2O6.5 sample. Based on an analysis of the temperature dependence of the Raman spectrum of Sr3Mn2O6.5 and a comparison with the Raman spectrum of La0.4Sr2.6Mn2O7-delta (delta= 0.0 and 0.35), we conclude that the 'extra' modes should be viewed as disorder induced Raman scattering.

引用

页码：13809 / 13811

页数：3

共 17 条

[11] Layered manganites: Magnetic structure at extreme doping levels [J].