Single Crystal Neutron Diffraction Study of High Neutron Absorbing Compound EuGa 4

Single Crystal Neutron Diffraction Study of High Neutron Absorbing Compound EuGa 4
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高中子吸收化合物EuGa 4 的单晶中子衍射研究

DOI：
10.7566/jpscp.1.014009
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发表时间：
2014
期刊：
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影响因子：
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通讯作者：
T. Hanashima
T. Hanashima
中科院分区：
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文献类型：
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作者：
T. Kawasaki;K. Kaneko;N. Aso;A. Nakamura;M. Hedo;T. Nakama;Y. Ōnuki;T. Ohhara;R. Kiyanagi;K. Oikawa;I. Tamura;A. Nakao;K. Munakata;T. Hanashima

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利用位于日本物理研究中心（J-PARC）的SENJU飞行时间单晶中子衍射仪（BL 18）对EuGa 4单晶进行了中子衍射测量。尽管天然Eu（未被Eu同位素富集）具有极高的中子吸收，但观察到了大量的布拉格反射。晶格参数和晶格对称性TN（= 15 K）以上获得的位置和系统的消光的反射与预定义的单晶X射线衍射的结果是一致的。此外，在TN下方h+k+l =奇数的位置处清楚地观察到磁反射。因此，EuGa 4的反铁磁结构可以用传播矢量q =（0 0 0）来描述，这打破了体心对称性
Single crystal neutron diffraction measurement of EuGa4 has been carried out using time-of-flight single crystal neutron diffractometer SENJU at BL18 in MLF/J-PARC. In spite of extremely high neutron absorption of natural Eu (not enriched by Eu isotope), significant numbers of Bragg reflection were observed. Lattice parameters and lattice symmetry above TN (= 15 K) obtained from the positions and systematic extinction of the reflections were well agreed with the predefined results of single crystal X-ray diffraction. Furthermore, magnetic reflections were clearly observed below TN at positions of h+k+l = odd. Thus, antiferromagnetic structure of EuGa4 can be described with a propagation vector q = (0 0 0), which breaks a body-centered symmetry