Single crystal neutron diffraction study of high neutron absorbing compound EuGa

単結晶中性子回折法を用いた中性子吸収物質EuGaの研究

川崎 卓郎   ; 金子 耕士   ; 阿曽 尚文*; 仲村 愛*; 辺土 正人*; 仲間 隆男*; 大貫 惇睦*; 大原 高志   ; 鬼柳 亮嗣  ; 及川 健一   ; 田村 格良  ; 中尾 朗子*; 宗像 孝司*; 花島 隆泰*

Kawasaki, Takuro; Kaneko, Koji; Aso, Naofumi*; Nakamura, Ai*; Hedo, Masato*; Nakama, Takao*; Onuki, Yoshichika*; Ohara, Takashi; Kiyanagi, Ryoji; Oikawa, Kenichi; Tamura, Itaru; Nakao, Akiko*; Munakata, Koji*; Hanashima, Takayasu*

Single crystal neutron diffraction measurement of EuGa 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, significant numbers of Bragg reflection were observed. Lattice parameters and Bravais lattice at above (=15 K) obtained from the positions and systematic extinction of the reflections were well agreed with the result of single crystal X-ray diffraction. Further, magnetic reflections were clearly observed at below at the positions of forbidden reflections of body-centered lattice of EuGa. An antiferromagnetic structure with the propagation vector = 0 was clarified.