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1. Electron- and Hole-Doping Effects in Manganites Studied by X-Ray Absorption Spectroscopy.

Author

Asokan, K., Jan, J. C., Rao, K. V. R., Chiou, J. W., Tsai, H. M., Pong, W. F., Tsai, M.-H., and Kumar, Ravi

Subjects
*MANGANITE, *ELECTRONIC structure, *X-ray spectroscopy, *X-ray absorption near edge structure, *MANGANESE, *IONS
Abstract

We investigate the electronic structures of hole-doped, La0.7Ca0.3MnO3, and electron-doped, La0.7Ce0.3MnO3, manganites by x-ray absorption near edge structure (XANES) spectroscopy at the O and Mn K-edges. While, the O K-edge XANES results indicate that Ca and Ce doping induce holes in O 2 p derived states, the Mn K-edge XANES do not give any evidence for creation of the Mn4+ (or Mn2+) ions by Ca (or Ce) dopants. Such results further questions the validity of double exchange mechanism in understanding the anomalous properties of manganites. [ABSTRACT FROM AUTHOR]

Published
2005
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