Orbital Degeneracy, Orbital Polarization and X-ray Absorption Linear Dichroism in Transition-Metal Oxides(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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On the basis of exact diagonalization of a single-ion Hamiltonian, we calculate Mn and Ti L_<2,3> x-ray absorption linear dichroism (XLD) spectra for manganites with trivalent Mn ion and YTiO_3, where antiferro-orbital ordering among the degenerate e_g and t_<2g> states, respectively, are reported. For the orbital polarization given by a superposition of the doubly degenerate e_g states, the superposition is shown to be reflected in the integrated XLD intensity, while not in XLD spectral shape. In the case of the triply degenerate frg states, on the other hand, the superposition is shown to be reflected in both the integrated intensity and the spectral shape. In both eg and tig systems, XLD is shown to be a promising method in identifying orbital polarization.
社団法人日本物理学会の論文
2004-09-15