Analysis of f-p model for octupole ordering in NpO2

Details Analysis of f-p model for octupole ordering in NpO2 Analysis of f-p model for octupole ordering in NpO2

2005-05-23

arxiv.org/abs/cond-mat/0505548v2

Phys. Rev. B 72, 132411 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.72.132411

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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