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Analysis of f-p model for octupole ordering in NpO2

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Type
Published Article
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Submission Date
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DOI: 10.1103/PhysRevB.72.132411
arXiv ID: cond-mat/0505548
Source
arXiv
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Abstract

In order to examine the origin of octupole ordering in NpO2, we propose a microscopic model constituted of neptunium 5f and oxygen 2p orbitals. To study multipole ordering, we derive effective multipole interactions from the f-p model by using the fourth-order perturbation theory in terms of p-f hopping integrals. Analyzing the effective model numerically, we find a tendency toward \Gamma_{5u} antiferro-octupole ordering.

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