Helicity Selection of the Cycloidal Order in Noncentrosymmetric EuIrGe${}_3$

Abstract

The magnetic helicities of the cycloidal ordering in EuIrGe${}_3$, with a noncentrosymmetric tetragonal structure, have been studied by circularly polarized resonant X-ray diffraction. It is shown that the helicity of each cycloidal domain is uniquely determined and satisfies the symmetry relations of the $C_{4v}$ point group of the crystal structure. The result shows that the cycloidal helicity is determined by the Dzyaloshinskii-Moriya type antisymmetric exchange interaction. The domain selection and the phase transition by the external magnetic field along [100] and [110] have also been studied. It is shown that the cycloidal plane prefers to be perpendicular to the field and the transverse conical state is realized.

6 pages, 4 figures, 5 figures in the supplemental material, accepted for publication in J. Phys. Soc. Jpn

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Cited by in corpus (1)

• Distorted triangular skyrmion lattice in a noncentrosymmetric tetragonal magnet