Nature of Orbital Ordering in La0.5Sr1.5MnO4 is Studied by Soft X-ray Linear Dichroism
Abstract
We found that the conventional model of orbital ordering of 3x2-r2/3y2-r2 type in the eg states of La0.5Sr1.5MnO4 is incompatible with measurements of linear dichroism in the Mn 2p-edge x-ray absorption, whereas these eg states exhibit predominantly cross-type orbital ordering of x2-z2/y2-z2. LDA+U band-structure calculations reveal that such a cross-type orbital ordering results from a combined effect of antiferromagnetic structure, Jahn-Teller distortion, and on-site Coulomb interactions.
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