J. Phys. Soc. Jpn. 75S (2006) pp. 266-269  |Previous Article|  |Table of Contents|
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Proc. of 5th Int. Symposium on ASR-WYP-2005 – Advances in the Physics and Chemistry of Actinide Compounds –

Multipole Correlations in Low-Dimensional f-Electron Systems

Hiroaki Onishi and Takashi Hotta

By using a density matrix renormalization group method, we investigate the ground-state properties of a one-dimensional three-orbital Hubbard model on the basis of a j–j coupling scheme. For B₄⁰≠0, where B₄⁰ is a parameter to control cubic crystalline electric field effect, one orbital is itinerant, while other two are localized. Due to the competition between itinerant and localized natures, we obtain orbital ordering pattern which is sensitive to B₄⁰, leading to a characteristic change of Γ_3g quadrupole state into an incommensurate structure. At B₄⁰=0, all the three orbitals are degenerate, but we observe a peak at q=0 in Γ_3g quadrupole correlation, indicating a ferro-orbital state, and the peak at q=π in Γ_4u dipole correlation, suggesting an antiferromagnetic state. We also discuss the effect of Γ_4u octupole on magnetic anisotropy.

URL: http://jpsj.ipap.jp/link?JPSJS/75S/266/
DOI: 10.1143/JPSJS.75S.266

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