Magnetic ordering, orbital ordering, and resonant x-ray scattering in perovskite titanates

被引：39

作者：

Ishihara, S ^{[1
]}

Hatakeyama, T

Maekawa, S

机构：

[1] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan

[2] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

来源：

PHYSICAL REVIEW B | 2002年 / 65卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.65.064442

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effective Hamiltonian for perovskite titanates is derived by taking into account the threefold degeneracy of t(2e) orbitals and the strong electron-electron interactions. The magnetic and orbital ordered phasew are studied in the mean-field approximation applied to the effective Hamiltonian. A large degeneracy of the orbital states in the ferromagnetic phase is found in contrast to the case of the doubly degenerate e(g) orbitals. Lifting of this orbital degeneracy due to lattice distortions and spin-orbit coupling is examined. A general form for the scattering cross section of the resonant x-ray scattering is derived and is applied to the recent experimental results in YTiO3. The spin wade dispersion relation in the orbital ordered YTiO3 is also studied.

引用

页码：644421 / 644429

页数：9

共 44 条

[1] VARIATION OF OPTICAL GAPS IN PEROVSKITE-TYPE 3D TRANSITION-METAL OXIDES [J].