Multipole as $f$-Electron Spin-Charge Density in Filled Skutterudites

Details Multipole as $f$-Electron Spin-Charge Density in Filled Skutterudites Multipole as $f$-Electron Spin-Charge Density in Filled Skutterudites

2008-03-18

arxiv.org/abs/0803.2563v1

J. Phys. Soc. Jpn. 77 Suppl. A, 96-101 (2008).

Physics

Condensed Matter

Strongly Correlated Electrons

To appear in the Proceedings of International Conference on "New Quantum Phenomena in Skutterudite and Related Systems" (Septe

Scientific paper

It is shown that $f$-electron multipole is naturally defined as spin-charge one-electron density operator in the second-quantized form with the use of tensor operator on the analogy of multipole expansion of electromagnetic potential from charge distribution in electromagnetism. Due to this definition of multipole, it is possible to determine multipole state from a microscopic viewpoint on the basis of the standard linear response theory for multipole susceptibility. In order to discuss multipole properties of filled skutterudites, we analyze a seven-orbital impurity Anderson model by employing a numerical renormalization group method. We show our results on possible multipole states of filled skutterudite compounds.

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