Geometric local structure at the Mn site in charge-ordered mixed valence manganites

被引：0

作者：

Sánchez, MC ^{[1
]}

García, J ^{[1
]}

Subías, G ^{[1
]}

Blasco, J ^{[1
]}

Proietti, MG ^{[1
]}

机构：

[1] Univ Zaragoza, CSIC, Inst Ciencia Mat Aragon, E-50009 Zaragoza, Spain

来源：

JOURNAL OF SYNCHROTRON RADIATION | 2001年 / 8卷 / 02期

关键词：

EXAFS; charge-ordering; giant magnetoresistance;

D O I：

10.1107/S0909049501000164

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

An extensive study of Mn K-edge absorption spectroscopy has been carried out in La1-xCaxMnO3 and Tb1-xCaxMnO3 (x=0, 0.33, 0.5, 0.67, 1) series as a function of temperature. The EXAFS analysis for the charge ordering compounds (x greater than or equal to 0.5) shows the presence of a static distortion of the MnO6 octahedron in the whole temperature range. However, this local distortion is lower than the distortion found for Jahn-Teller compounds. Magnetoresistive compounds (x=0.33) show a regular octahedron in the low temperature metallic phase. Instead, no changes are found for the first coordination shell (Mn-O) across the charge ordering transition while Mn-Mn distribution shows minor variations with the temperature. The structural analysis of the second coordination shell suggests that the Mn-O-Mn angle is the most relevant parameter to describe the electric and magnetic behaviour of these compounds.

引用

页码：904 / 906

页数：3

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