Cr-doping effect on the structural, magnetic, transport properties and Raman spectroscopy of La(2+x)/3Sr(1-x)/3Mn1-xCrxO3 perovskites

被引：5

作者：

Li, W. J.

Zhang, Bo ^{[1
]}

Lu, W.

Sun, Y. P.

Zhang, Yuheng

机构：

[1] Chinese Acad Sci, Shanghai Inst Tech Phys, Natl Lab Infrared Phys, Shanghai 200083, Peoples R China

[2] Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Peoples R China

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2007年 / 68卷 / 09期

基金：

中国国家自然科学基金;

关键词：

Raman spectroscopy;

D O I：

10.1016/j.jpcs.2007.04.021

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A series of the double-doping samples La(2+x)/3Sr(1-4x)/3Mn1-xCrxO3 (0 <= x <= 0.25) with the Mn3+/Mn4+ ratio fixed at 2:1 have been fabricated. The structural, magnetic, transport properties and Raman spectroscopy have been investigated, and no apparent crystal structure change is introduced by Cr doping up to x = 0.25. But the Curie temperature T-C and metal-insulator transition temperature T-MI are strongly affected by Cr substitution. The room temperature Raman spectra start exhibiting some new features following the increasing concentration of Cr substitutions. Moreover, it is worth noting that the frequency of the A(1g) phonon mode can also be well correlated with the A-site mismatch effect (sigma(2)), which is influenced mainly by the variety of the Sr content. (C) 2007 Elsevier Ltd. All rights reserved.

引用

页码：1749 / 1755

页数：7

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