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The magnetic structure of EuTi₂Al₂₀, in which magnetic Eu^2+ ions form a diamond network, was investigated using neutron and resonant X-ray diffraction on powder and single-crystal samples. The propagation vector was determined to be q ₌= (1, 0, 0) ~r. l. u. from these diffraction measurements. All possible magnetic structures in the space group Fd3m with this propagation vector were examined using the irreducible representation method and magnetic space group analysis. This magnetic structure was identified as a collinear antiferromagnetic structure with the magnetic space group PInna (\#52. 320) or PInn2 (\#34. 164) under zero magnetic field. In these magnetic structure, frustration arises from competing magnetic interactions on the diamond network. These findings provide a concrete experimental reference for assessing the role of competing interactions in diamond-network magnets and motivate further studies of interaction-driven quantum states.
Kawamata et al. (Thu,) studied this question.