High resolution x-ray absorption near edge structure at the Mn K edge of manganites

被引：76

作者：

García, J ^{[1
]}

Sánchez, MC ^{[1
]}

Subías, G ^{[1
]}

Blasco, J ^{[1
]}

机构：

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

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2001年 / 13卷 / 14期

关键词：

D O I：

10.1088/0953-8984/13/14/301

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We report a systematic study of manganese perovskites, RE1-xDxMnO3 (RE = rare earth; B = Ca, Sr): by means of x-ray absorption near edge structure (XANES) spectroscopy at the Mn K edge. High resolution has been achieved by recording the intensity of the Mn K beta fluorescence spectrum. All the samples show a unique resonance at the Mn K edge. This common feature does not depend on small changes in the local structure around the Mn atom. The XANES spectra of mixed (0 < x < 1) composition compounds cannot be obtained by linear combination of REMnO3 and DMnO3 spectra. Therefore, Mn3+ and Mn4+ ions cannot be distinguished in intermediate RE1-xDxMnO3 compounds, either spatially or temporally The possibility of a charge disproportionation is also considered and discussed in the paper.

引用

页码：3229 / 3241

页数：13

共 43 条

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