Multipole Ordering and Fluctuations in f-Electron Systems

Details Multipole Ordering and Fluctuations in f-Electron Systems Multipole Ordering and Fluctuations in f-Electron Systems

2005-12-26

arxiv.org/abs/cond-mat/0512647v1

J. Phys. Soc. Jpn. 75 Suppl., 232 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 4 figures, Proceedings of ASR-WYP-2005

Scientific paper

We investigate effects of multipole moments in f-electron systems both from phenomenological and microscopic viewpoints. First, we discuss significant effects of octupole moment on the magnetic susceptibility in a paramagnetic phase. It is found that even within mean-field approximation, the magnetic susceptibility deviates from the Curie-Weiss law due to interactions between dipole and octupole moments. Next, we proceed to a microscopic theory for multipole ordering on the basis of a j-j coupling scheme. After brief explanation of a method to derive multipole interactions from the $f$-electron model, we discuss several multipole ordered phases depending on lattice structure. Finally, we show our new development of the microscopic approach to the evaluation of multipole response functions. We apply fluctuation exchange approximation to the f-electron model, and evaluate multipole response functions.

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