Lattice distortion and octupole ordering model in CexLa 1-xB6

Katsunori Kubo, Yoshio Kuramoto

研究成果: Article査読

39 被引用数 (Scopus)

抄録

Possible order parameters of the phase IV in CexLa 1-xB6 are discussed with special attention to the lattice distortion recently observed. A Γ5u-type octupole order with a finite wave number is proposed as the origin of the distortion along the [111] direction. The Γ8 crystalline electric field (CEF) level splits into three levels by a mean field with the Γ5u symmetry. The ground and highest singlets have the same quadrupole moment, while the intermediate doublet has an opposite sign. It is shown that any collinear order of the Γ5u-type octupole moment accompanies the Γ5g-type ferro-quadrupole order, and the coupling of the quadrupole moment with the lattice induces the distortion. The cusp in the magnetization at the phase transition is reproduced, but the internal magnetic field due to the octupole moment is smaller than the observed one by an order of magnitude.

本文言語English
ページ(範囲)1859-1862
ページ数4
ジャーナルjournal of the physical society of japan
72
8
DOI
出版ステータスPublished - 2003 8月
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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