Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-08-23
Phys. Rev. B 70, 100402(R) (2004)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 3 figures, to appear in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.70.100402
In order to clarify a key role of orbital degree of freedom in the spin S=1 Haldane system, we investigate ground-state properties of the t2g-orbital degenerate Hubbard model on the linear chain by using numerical techniques. Increasing the Hund's rule coupling in multi-orbital systems, in general, there occurs a transition from an antiferromagnetic to a ferromagnetic phase. We find that the antiferromagnetic phase is described as the Haldane system with spin gap, while in the ferromagnetic phase, there exists the gapless excitation with respect to orbital degree of freedom. Possible relevance of the present results to actual systems is also discussed.
Hotta Takashi
Onishi Hiroaki
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