Lattice Distortion and Octupole Ordering Model in CexLa1 xB6

Lattice Distortion and Octupole Ordering Model in CexLa1 xB6
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CexLa1 xB6 中的晶格畸变和八极排序模型

DOI:
10.1143/jpsj.72.1859
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发表时间:
2003
影响因子:
1.7
通讯作者:
Y. Kuramoto
Y. Kuramoto
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
K. Kubo;Y. Kuramoto

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讨论了Ce x La 1- x B 6中IV相的可能序参量,并特别注意最近观察到的晶格畸变。提出了一个具有有限波数的Γ 5 u型八极阶是[111]方向沿着畸变的根源.晶体电场(CEF)能级被具有Γ 5 u对称性的平均场分裂成三个能级。基态和最高的单线态具有相同的四极矩,而中间的双线态具有相反的符号。结果表明,任意共线阶的Γ 5 u型八极矩都伴随着Γ 5g型铁四极矩,四极矩与晶格的耦合导致了畸变.在相变的磁化尖再现,但由于八极矩的内部磁场比观察到的一个小一个数量级。
Possible order parameters of the phase IV in Ce x La 1- x B 6 are discussed with special attention to the lattice distortion recently observed. A Γ 5 u -type octupole order with a finite wave number is proposed as the origin of the distortion along the [111] direction. The Γ 8 crystalline electric field (CEF) level splits into three levels by a mean field with the Γ 5 u 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 5 u -type octupole moment accompanies the Γ 5 g -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.
DOI: --
发表时间: 2002
期刊: J. Phys. Soc. Jpn. 71
影响因子: --
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