Orbital Order and Fluctuations in Mott Insulators(Yukawa International Seminar 2004 (YKIS2004) Physics of Strongly Correlated Electron Systems)

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概要

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• Basic mechanisms controlling orbital order and orbital fluctuations in transition metal oxides are discussed. The lattice driven classical orbital picture, e.g. like in manganites LaMnO_3, is contrasted to the quantum behavior of orbitals in frustrated superexchange models as realised in pseudocubic titanites ATiO_3 and vanadates AVO_3. In YVO_3, the lattice and superexchange effects strongly compete-this explains the extreme sensitivity of magnetic states to temperature and doping. Lifting the t_<2g> orbital degeneracy by a relativistic spin-orbital coupling is considered on example of the layered cobaltates. We find that the spin-orbital mixing of low-energy states leads to unusual magnetic correlations in a triangular lattice of the CoO_2 parent compound. Finally, the magnetism of sodium-rich compounds Na_<1-x>CoO_2 is discussed in terms of a spin/orbital polaronic liquid.

• 理論物理学刊行会の論文
• 2006-02-06

著者

• Khaliullin Giniyat

  Max-Planck-Institut fur Festkorperforschung

関連論文

• 強磁性チタン酸化物における軌道秩序と磁気相互作用(2002年度基研研究会「軌道自由度を持つ強相関電子系の理論の進展」,研究会報告)
• Orbital Order and Fluctuations in Mott Insulators(Yukawa International Seminar 2004 (YKIS2004) Physics of Strongly Correlated Electron Systems)
• Unusual Electron Correlations in Na_xCoO_2 Due to the Spin-State Quasidegeneracy of Cobalt Ions(Interaction and Nanostructural Effects in Low-Dimensional Systems)

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