Single crystal neutron diffraction study of high neutron absorbing compound EuGa

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.