Nature of Orbital Ordering in La_0.5Sr_1.5MnO_4 is Studied by Soft X-ray Linear Dichroism

A. Fujimori; A. Tanaka; C. F. Chang; C. T. Chen; D. J. Huang; G. Y. Guo; H. B. Huang; H-J Lin; Kimura; T. Jo

arxiv: cond-mat/0312690 · v1 · submitted 2003-12-30 · ❄️ cond-mat.str-el

Nature of Orbital Ordering in La₀.5Sr₁.5MnO₄ is Studied by Soft X-ray Linear Dichroism

D. J. Huang , W. B. Wu , G. Y. Guo , H-J Lin , T. Y. Hou , C. F. Chang , C. T. Chen , A. Fujimori

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Kimura H. B. Huang A. Tanaka T. Jo

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keywords orbitalorderingcross-typedichroismlinearstatesx-rayabsorption

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We found that the conventional model of orbital ordering of 3x^2-r^2/3y^2-r^2 type in the eg states of La_0.5Sr_1.5MnO_4 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 x^2-z^2/y^2-z^2. 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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Nature of Orbital Ordering in La₀.5Sr₁.5MnO₄ is Studied by Soft X-ray Linear Dichroism

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