ELECTRONIC STRUCTURES OFLa0.7Ca0.3MnO3ANDLa0.7Ce0.3MnO3BY X-RAY ABSORPTION SPECTROSCOPY

K. Asokan (), K. V. R. Rao, J. C. Jan, J. W. Chiou, W. F. Pong, Ravi Kumar, Shahid Husain and J. P. Srivastava
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K. Asokan: Department of Physics, Tamkang University, Tamsui 251, Taiwan, R.O.C.
K. V. R. Rao: Department of Physics, Tamkang University, Tamsui 251, Taiwan, R.O.C.
J. C. Jan: Department of Physics, Tamkang University, Tamsui 251, Taiwan, R.O.C.
J. W. Chiou: Department of Physics, Tamkang University, Tamsui 251, Taiwan, R.O.C.
W. F. Pong: Department of Physics, Tamkang University, Tamsui 251, Taiwan, R.O.C.
Ravi Kumar: Nuclear Science Centre, Aruna Asaf Ali Marg, New Delhi-110 067, India
Shahid Husain: Department of Physics, Aligarh Muslim University, Aligarh-202002, India
J. P. Srivastava: Department of Physics, Aligarh Muslim University, Aligarh-202002, India

Surface Review and Letters (SRL), 2002, vol. 09, issue 02, 1053-1057

Abstract: Electronic structures of hole-doped and electron hole-doped manganites,La0.7Ca0.3MnO3andLa0.7Ce0.3MnO3, have been elucidated by X-ray absorption near-edge structure (XANES) spectra of OK- and MnL3,2-edges. In the electron-doped system,La0.7Ce0.3MnO3, the spectral features of OK-edge spectra are shifted by ~ 1 eV towards the higher energy side and reduction of Mn valency from4+and3+to3+and2+is expected when compared to hole-doped manganite. The XANES of CeM5,4-edges indicates a tetravalent state for Ce, similar to that inCeO2.Ce4+is incorporated into the lattice ofLaMnO3, resulting in the modification ofMnO6octahedra and also indicating strong hybridization of Ce 5d and/or Ce 4f states with O 2p states.

Date: 2002
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DOI: 10.1142/S0218625X02003330

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