Magnetic order of Dresselhaus-type antiferromagnet EuIrInGe studied by single crystal neutron diffraction

田端 千紘; 金子 耕士   ; 中尾 朗子*; 大原 高志   ; 松田 達磨*; 大貫 惇睦*

Tabata, Chihiro; Kaneko, Koji; Nakao, Akiko*; Ohara, Takashi; Matsuda, Tatsuma*; Onuki, Yoshichika*

The magnetic order of EuIrInGe, which crystallizes in a Dresselhaus-type noncentrosymmetric tetragonal structure, was investigated using two complementary single-crystal neutron diffraction approaches. Time-of-flight single-crystal diffraction reveals antiferromagnetic Bragg reflections with propagation vector q = (0, 0, 0) below the Neel temperature TN = 2.5 K, indicating a breaking of body-centered translational symmetry. Polarized neutron diffraction on a triple-axis spectrometer demonstrates that the ordered Eu2+ 4f moments lie within the basal plane and form a collinear antiferromagnetic structure with antiparallel alignment between corner and body-center sites. Despite the Dresselhaus-type spin splitting in the conduction bands, the magnetic order remains simple, implying weak coupling between localized moments and itinerant electrons.