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Orbital-based Scenario for Magnetic Structure of Neptunium Compounds
Hiroaki Onishi, Takashi Hotta
In order to understand a crucial role of orbital degree of freedom in the magnetic structure of recently synthesized neptunium compounds NpTGa_5 (T=Fe, Co, and Ni), we propose to d…
Suppression of Spin Frustration due to Orbital Selection
Hiroaki Onishi, Takashi Hotta
In order to clarify a crucial role of orbital degree of freedom in geometrically frustrated systems, we investigate both ground- and excited-state properties of the e_g-orbital deg…
Orbital-controlled magnetic transition between gapful and gapless phases in the Haldane system with t2g-orbital degeneracy
Hiroaki Onishi, Takashi Hotta
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 th…
Key Role of Orbital Anisotropy in Geometrically Frustrated Electron System
Hiroaki Onishi, Takashi Hotta
By using the density matrix renormalization group method, we investigate ground- and excited-state properties of the e_g-orbital degenerate Hubbard model at quarter filling for two…