Large ferroquadrupole moment induced in the octupole-ordered Ce0.7La0.3B6 revealed by high-resolution x-ray diffraction
Large ferroquadrupole moment induced in the octupole-ordered Ce0.7La0.3B6 revealed by high-resolution x-ray diffraction
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高分辨率 X 射线衍射揭示了八极有序 Ce0.7La0.3B6 中诱导的大铁四极矩
DOI：
10.1103/physrevb.90.041108
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
and F. Iga
中科院分区：
文献类型：
--
作者：
T. Inami;S. Michimura;Y. Hayashi;T. Matsumura;M. Sera;and F. Iga
我们对在K以下具有交错阶八极矩的晶体进行了高分辨X射线衍射实验。理论上，预测了伴随反铁八极序的铁四极矩和由此产生的立方晶格的菱面体变形。与此相反，在实验中，没有直接证据的菱形晶格已获得。我们观察到下面布拉格峰的分裂，发现晶胞是一个沿[111]轴沿着拉长的菱面体。菱面体畴对磁场的响应也与理论计算相吻合。这个实验的一个特别的结果是，诱导的四极矩的大小是精确地评估从所获得的剪切应变。利用这一结果，还讨论了隐八极矩的大小。
We carried out a high-resolution x-ray diffraction experiment onthat exhibits staggered order ofoctupole moments belowK. Theoretically, ferroquadrupole moments that accompany the antiferro-octupole order and a resultant rhombohedral deformation of the cubic lattice were predicted. In contrast, experimentally, no direct evidence of the rhombohedral lattice has been obtained. We observe the splitting of Bragg peaks belowand find that the unit cell is a rhombohedron being elongated along the [111] axis. The response of rhombohedral domains to magnetic fields also well agrees with theoretical calculations. A particular outcome of this experiment is that the magnitude of the induced quadrupole moments is precisely evaluated from the obtained shear strain. Using this result, the magnitude of the hidden octupole moments is also discussed.