Hybridization and multipole orders of 4f electrons in Pr skutterudites

Yoshio Kuramoto, Annamária Kiss, Junya Otsuki, Hiroaki Kusunose

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)209-214
Number of pages6
Journaljournal of the physical society of japan
Volume75
Issue numberSUPPL.
DOIs
Publication statusPublished - Jan 1 2006
Externally publishedYes

Keywords

  • Quadrupole order
  • Quantum fluctuation
  • Resonant X-ray scattering
  • Skutterudite

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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