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

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.