Microscopic theory of multipole ordering in NpO

Kubo, Katsunori ; Hotta, Takashi

In order to examine the mysterious ordered phase of NpO from a microscopic viewpoint, we investigate an -electron model on an fcc lattice constructed based on a - coupling scheme. First, an effective model with multipole interactions is derived in the strong-coupling limit. Numerical analysis of the model clearly indicates that the interactions for $Gamma_{4u}$ and $Gamma_{5u}$ moments are relevant to the ground state. Then, by applying mean-field theory to the simplified model including only such interactions, we conclude that longitudinal triple- $Gamma_{5u}$ octupole order is realized in NpO through the combined effects of multipole interactions and anisotropy of the $Gamma_{5u}$ moment.

Language	:	English
Journal	:	Physical Review B
Volume	:	71
Number	:	14
Pages	:	p.140404_1 - 140404_4
Publication Year/Month	:	2005/04
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Paper URL	:	https://doi.org/10.1103/PhysRevB.71.140404
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Keywords	:	NpO; - Coupling Scheme; Octupole
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Registration No. : A20050018
JAEA Abstracts No. : 330633
Paper Submission No. : 21951

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