Lattice Distortion and Octupole Ordering Model in Ce_xLa_<1-x>B_6
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概要
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Possible order parameters of the phase IV in Ce_xLa_<1-x>B_6 are discussed with special attention to the lattice distortion recently observed. AΓ_<5u>-type octupole order with a finite wave number is proposed as the origin of the distortion along the [111] direction. TheΓ_8 crystalline electric field (CEF) level splits into three levels by a mean field with theΓ_<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 the Γ_<5u>-type octupole moment accompanies theΓ_<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.
- 社団法人日本物理学会の論文
- 2003-08-15
著者
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Kuramoto Yoshio
Department Of Applied Physics Faculty Of Engineering Tohoku University
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Kubo Katsunori
Department Of Physics Tohoku University
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