“…[20][21][22][23][24] The magnetic properties of EuRhGe 3 and EuIrGe 3 have also been well studied. [25][26][27] In spite of weak magnetic anisotropies of Eu 2+ , these compounds exhibit multiple magnetic phases in the temperature (T ) vs magnetic field (H) space, suggesting a subtle energy balance among various magnetic structures, which is of great interest. EuIrGe 3 , the subject compound of this paper, exhibits successive phase transitions at T N =12.2 K, T ′ N =7.0 K, and T * N =5.0 K. 18,26) The crystal structure and the physical properties of EuIrGe 3 are summarized in Fig.…”