Magnetic field induced triple-
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-
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
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-
magnetic ordered state that is described by three propagation vectors lying in the plane normal to the magnetic field direction;
,
, and
. With the high resolution in the reciprocal space achieved in the RXS measurement, it is suggested that the triple-
order strongly couples with the underlying crystal lattice. The triple-
magnetic order is discussed in the context of a magnetic skyrmion lattice on which the geometrical frustration may play a crucial role.