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Report No.

Single crystal neutron diffraction study of high neutron absorbing compound EuGa$$_{4}$$

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$$_{4}$$ 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 $$T_mathrm{N}$$ (=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 $$T_mathrm{N}$$ at the positions of forbidden reflections of body-centered lattice of EuGa$$_{4}$$. An antiferromagnetic structure with the propagation vector $$q$$ = 0 was clarified.



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