Cycloidal magnetic ordering in noncentrosymmetric EuIrGe

Matsumura, Takeshi*; Tsukakoshi, Mitsuru*; Ueda, Yoshihisa*; Higa, Nonoka*; Nakao, Akiko*; Kaneko, Koji   ; Kakihana, Masashi*; Hedo, Masato*; Nakama, Takao*; Onuki, Yoshichika*

Successive magnetic phase transitions in EuIrGe, an intermetallic compound with a body centered tetragonal lattice belonging to a polar space group I4mm, has been investigated by neutron diffraction and resonant X-ray diffraction. It is shown that EuIrGe exhibits an incommensurate longitudinal sinusoidalorder with (0, 0, 0.792) and m c-axis in the high temperature phase, which changes to a cycloidal order with = (, 0, 0.8) ( 0.017) and m ac-plane in the intermediate phase. In the low temperature phase, the cycloidal plane rotates by 45 to have =(, 0.8) (0.012). It is also pointed out that the X-ray scattering amplitude from odd-parity magnetic quadrupole due to the polar environment interfere with that from normal even-parity magnetic dipole in the magnetic ordered phase.