Orbital wave and its observation in orbital-ordered titanates and vanadates
Orbital wave and its observation in orbital-ordered titanates and vanadates
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DOI：
10.1103/physrevb.69.075118
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发表时间：
2003-09
影响因子：
3.7
通讯作者：
S. Ishihara
中科院分区：
文献类型：
--
作者：
S. Ishihara
We present a theory of the collective orbital excitation termed orbital wave in perovskite titanates and vanadates with the triply degenerate ${t}_{2g}$ orbitals. The dispersion relations of the orbital waves for the orbital-ordered ${\mathrm{LaVO}}_{3},$ ${\mathrm{YVO}}_{3}$ and ${\mathrm{YTiO}}_{3}$ are examined in the effective spin-orbital coupled Hamiltonians associated with the Jahn-Teller type couplings. We propose possible scattering processes for the Raman and inelastic neutron scatterings from the orbital wave and calculate the scattering spectra for titanates and vanadates. It is found that both the excitation spectra and the observation methods of the orbital wave are distinct qualitatively from those for the ${e}_{g}$ orbital-ordered systems.
We present a theory of the collective orbital excitation termed orbital wave in perovskite titanates and vanadates with the triply degenerate ${t}_{2g}$ orbitals. The dispersion relations of the orbital waves for the orbital-ordered ${\mathrm{LaVO}}_{3},$ ${\mathrm{YVO}}_{3}$ and ${\mathrm{YTiO}}_{3}$ are examined in the effective spin-orbital coupled Hamiltonians associated with the Jahn-Teller type couplings. We propose possible scattering processes for the Raman and inelastic neutron scatterings from the orbital wave and calculate the scattering spectra for titanates and vanadates. It is found that both the excitation spectra and the observation methods of the orbital wave are distinct qualitatively from those for the ${e}_{g}$ orbital-ordered systems.