Open AccessMn K ‐edge XANES spectra of manganites measured by K β emission
Author(s) -
García J.,
Sánchez M. C.,
Subías G.,
Blasco J.,
Proietti M. G.
Publication year - 2001
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049501000310
Subject(s) - xanes , valence (chemistry) , spectral line , spectroscopy , electronic structure , k edge , absorption spectroscopy , materials science , analytical chemistry (journal) , x ray spectroscopy , emission spectrum , atom (system on chip) , chemistry , atomic physics , physics , computational chemistry , optics , organic chemistry , chromatography , quantum mechanics , astronomy , computer science , embedded system
The electronic state of Mn atoms in mixed valence manganites has been studied by means of X‐ray absorption spectroscopy at the Mn K‐edge. Higher resolution than in conventional measurements has been achieved by measuring the Mn K β fluorescence line. We have found a unique resonance at the edge in the XANES spectra of intermediate composition RE 1−x Ca x MnO 3 samples. The features of these XANES spectra do not depend on small changes in the local structure around the Mn atom. However, the spectra of the intermediate composition samples can not be reproduced by a linear combination of REMnO 3 and CaMnO 3 spectra. Accordingly, the electronic state of Mn atoms in these compounds can not be considered as a mixture of Mn 3+ and Mn 4+ pure states.