X-ray spectroscopy of lanthanum manganites: Nature of doping holes, correlation effects, and orbital ordering
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The Mn3s X-ray photoelectron spectra of manganites were studied. It was shown that for the formal valence of manganese from 3+ to 3.3+, the doping holes are O2p in character; as the valence of manganese increases further, the Mn3d states acquire holes. For La0.7Sr0.3MnO3, the Mn3p-3d resonance spectra provided information about the occupied and unoccupied Mn3d states, and the correlation energy U = 6.7 eV was determined experimentally. An analysis of X-ray dichroism on the L absorption spectra of three-dimensional La7/8Sr1/8MnO3 showed that the cooperative Jahn Teller distortion of the orthorhombic phase at 240 K was related to (x 2 − z 2)/(y 2 − z 2) type orbital ordering.
KeywordsX-ray photoelectron spectra dichroism manganites orbital ordering correlation energy doping holes
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- 9.K. Kuepper, M. C. Falub, K. C. Prince, et al., J. Phys. Chem., 109, 9354 (2005).Google Scholar
- 16.J. Geck, P. Wochner, D. Bruns, et al., Phys. Rev. B, 69, 104413 (2004).Google Scholar
- 17.K. Kuepper, F. Bondino, K. C. Prince, et al., J. Phys. Chem. B, 109, 15667 (2005).Google Scholar
- 18.H. J. Huang, W. B. Wu, G. Y. Guo, et al., Phys. Rev. Lett., 92, 087202 (2004).Google Scholar