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Magnetic field induced triple-$$q$$ magnetic order in trillium lattice antiferromagnet EuPtSi studied by resonant X-ray scattering

共鳴X線散乱によるトリリウム格子反強磁性体EuPtSiの磁場誘起triple-$$q$$秩序の研究

田端 千紘*; 松村 武*; 中尾 裕則*; 道村 真司*; 垣花 将司*; 稲見 俊哉*; 金子 耕士; 辺土 正人*; 仲間 隆男*; 大貫 惇睦*

Tabata, Chihiro*; Matsumura, Takeshi*; Nakao, Hironori*; Michimura, Shinji*; Kakihana, Masashi*; Inami, Toshiya*; Kaneko, Koji; Hedo, Masato*; Nakama, Takao*; Onuki, Yoshichika*

The magnetic order in the magnetic-fild-induced so-called A phase of cubic chiral antiferromagnet EuPtSi was investigated by resonant X-ray scattering (RXS) near the Eu $$L_{2}$$ edge. The high flux RXS signal under the magnetic field applied along [111] revealed the first and second order satellite magnetic reflections, indicating that the A phase is a triple-$$q$$ magnetic ordered state that is described by three propagation vectors lying in the plane normal to the magnetic field direction; $$q_1$$, $$q_2$$, and $$q_3$$. With the high resolution in the reciprocal space achieved in the RXS measurement, it is suggested that the triple-$$q$$ order strongly couples with the underlying crystal lattice. The triple-$$q$$ magnetic order is discussed in the context of a magnetic skyrmion lattice on which the geometrical frustration may play a crucial role.

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