Microscopic Aspects of Multipole Properties of Filled Skutterudites

Details Microscopic Aspects of Multipole Properties of Filled Skutterudites Microscopic Aspects of Multipole Properties of Filled Skutterudites

2006-10-18

arxiv.org/abs/cond-mat/0610502v1

J. Magn. Magn. Mater. 310, 1691 (2007).

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 3 figures. To appear in the Proceedings of the 17th International Conference on Magnetism (ICM2006)

Scientific paper

10.1016/j.jmmm.2006.10.899

We discuss low-temperature multipole states of Nd-based filled skutterudites by analyzing a multiorbital Anderson model with the use of a numerical renormalization group method. In order to determine the multipole state, we take a procedure to maximize the multipole susceptibility matrix. Then, it is found that the dominant multipole state is characterized by the mixture of 4u magnetic and 5u octupole moments. The secondary state is specified by 2u octupole. When we further take into account the coupling between $f$ electrons in degenerate $\Gamma_{67}^{-}$ ($e_{\rm u}$) orbitals and dynamical Jahn-Teller phonons with $E_{\rm g}$ symmetry, quadrupole fluctuations become significant at low temperatures in the mixed multipole state with 4u magnetic and 5u octupole moments. Finally, we briefly discuss possible relevance of the present results to actual Nd-based filled skutterudite compounds.

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