Hybridization and multipole orders of 4f electrons in Pr skutterudites

Yoshio Kuramoto, Annamária Kiss, Junya Otsuki, Hiroaki Kusunose

研究成果: Article査読

12 被引用数 (Scopus)

抄録

Characteristics of hybridization and multipole orders of 4f-electrons in Pr skutterudites are explained in terms of a pseudo-quartet composed of crystalline electric field (CEF) singlet and the triplet. It is shown that the contrasting behaviors observed in PrFe4P12 and PrOs 4Sb12 are ascribed to the difference in triplet wave functions and the CEF splittings. Since a macroscopic degeneracy remains even in the ordered phase with the Γ3-type antiferro-quadrupole (AFQ) order, a model with strong AFQ fluctuation and static monopole/hexadecapole order is proposed for PrFe4P12. The remaining cubic symmetry explains qualitatively the behavior of staggered magnetization observed by NMR and neutron scattering. For identification of possible hexadecapole orders in PrFe4P12 and PrRu4P12, eightfold intensity pattern is predicted in the azimuthal angle scan of resonant X-ray scattering. In PrOs4Sb12, the ferromagnetic exchange coupling with the conduction band does not lead to magnetic Kondo effect, but a momentum-dependent quadrupole coupling can give rise to enhanced effective mass, which should be sensitive to disorder.

本文言語English
ページ(範囲)209-214
ページ数6
ジャーナルjournal of the physical society of japan
75
SUPPL.
DOI
出版ステータスPublished - 2006
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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