Magnetic structure of divalent europium compound EuGa studied by single-crystal time-of-flight neutron diffraction

単結晶TOF中性子回折を用いたEuGaの磁気構造に関する研究

川崎 卓郎   ; 金子 耕士   ; 仲村 愛*; 阿曽 尚文*; 辺土 正人*; 仲間 隆男*; 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*; 大貫 惇睦*

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

The magnetic structure of the intermetallic compound EuGa was investigated using single-crystal neutron diffraction with TOF Laue technique on the new diffractometer SENJU at MLF of J-PARC. Despite of the high neutron absorption of Eu, a vast number of diffraction spots were observed without isotope enrichment. The magnetic reflections appeared at 2 below 16 K, indicating that the ordering vector is = (0, 0, 0). The continuous evolution of the magnetic reflection intensity below T follows a squared Brillouin function for = 7/2. By adopting a wavelength-dependent absorption collection, the magnetic structure of EuGa revealed that a nearly full magnetic moment of 6.4 B of Eu lies within the basal plane of the lattice.