Origin of G-type antiferromagnetism and orbital-spin structures in LaTiO3

Masahito Mochizuki*, Masatoshi Imada

*この研究の対応する著者

研究成果: Article査読

34 被引用数 (Scopus)

抄録

The possibility of the D3d distortion of TiO6 octahedra is examined theoretically in order to understand the origin of the G-type antiferromagnetism [AFM(G)] and experimentally observed puzzling properties of LaTiO3. By utilizing an effective spin and pseudospin Hamiltonian with the strong Coulomb repulsion, it is shown that the AFM(G) state is stabilized through the lift of the t2g-orbital degeneracy accompanied by a tiny D3d-distortion. The estimated spin-exchange interaction is in agreement with that obtained by the neutron-scattering experiment. Moreover, the level-splitting energy due to the distortion can be considerably larger than the spin-orbit interaction even when the distortion becomes smaller than the detectable limit under the available experimental resolution. This suggests that the orbital momentum is fully quenched and the relativistic spin-orbit interaction is not effective in this system, in agreement with the result of a recent neutron-scattering experiment.

本文言語English
ページ(範囲)2872-2875
ページ数4
ジャーナルjournal of the physical society of japan
70
10
DOI
出版ステータスPublished - 2001 10月
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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