Strong Linear Dichroism in Mn L2,3 Absorption Predicted for Orbital Ordering in LaMnO3.

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  • Huang Hong Bin
    Department of Quantum Matter, ADSM, Hiroshima University, Higashi–Hiroshima 739–8526
  • Shishidou Tatsuya
    Department of Quantum Matter, ADSM, Hiroshima University, Higashi–Hiroshima 739–8526 Japan Science and Technology Corporation, Tokyo 102–0081
  • Jo Takeo
    Department of Quantum Matter, ADSM, Hiroshima University, Higashi–Hiroshima 739–8526

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  • Strong Linear Dichroism in Mn<i><i>L</i><sub><b>2,3</b></sub></i>Absorption Predicted for Orbital Ordering in LaMnO<sub><b>3</b></sub>

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Abstract

The difference in Mn L2,3 X-ray absorption spectrum between polarizations parallel and perpendicular to the c-axis, i.e., linear dichroism (LD), is discussed for LaMnO3, where 3d orbits 3x2-r2 and 3y2-r2 are suggested to align ``antiferromagnetically'' in the a-b plane. By a calculation on the basis of a single-ion model including the intraatomic 3d-3d and 3d-2p multipole interactions and a crystal field, we show that the basic multiplet structure of the LD spectrum strongly reflects 3d orbital ordering and is insensitive to the Jahn-Teller distortion of the MnO6 octahedra. LD is, therefore, shown to be a promising method to observe directly orbital ordering.

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