X-ray spectroscopy of lanthanum manganites: Nature of doping holes,correlation effects,and orbital ordering |
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| Authors: | V R Galakhov M C Falub K Kuepper M Neumann |
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| Institution: | 1.Institute of Metal Physics, Ural Division,Russian Academy of Sciences,Ekaterinburg,Russia;2.P. Scherrer Institute,Willigen,Switzerland;3.Rossendorf Research Center,Dresden,Germany;4.Osnabruck University,Osnabruck,Germany |
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| Abstract: | 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. |
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