Lattice Distortion and Octupole Ordering Model in CexLa1-xB6

Details Lattice Distortion and Octupole Ordering Model in CexLa1-xB6 Lattice Distortion and Octupole Ordering Model in CexLa1-xB6

2003-04-30

arxiv.org/abs/cond-mat/0304689v1

J. Phys. Soc. Jpn. 72, 1859 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures, submitted to J. Phys. Soc. Jpn

Scientific paper

10.1143/JPSJ.72.1859

Possible order parameters of the phase IV in CexLa1-xB6 are discussed with special attention to the lattice distortion recently observed. A \Gamma_{5u}-type octupole order with finite wave number is proposed as the origin of the distortion along the [111] direction. The \Gamma_8 crystalline electric field (CEF) level splits into three levels by a mean field with the \Gamma_{5u} 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 \Gamma_{5u}-type octupole moment accompanies the \Gamma_{5g}-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.

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