Incommensurate nature of the antiferromagnetic order in GdCu

GdCuの反強磁性秩序における非整合性

金子 耕士   ; 田端 千紘; 萩原 雅人   ; 山内 宏樹   ; 久保田 正人 ; 長壁 豊隆  ; 大貫 惇睦*

Kaneko, Koji; Tabata, Chihiro; Hagihara, Masato; Yamauchi, Hiroki; Kubota, Masato; Osakabe, Toyotaka; Onuki, Yoshichika*

A magnetic order in orthorhombic GdCu was investigated by a single crystal neutron diffraction with thermal neutron. Magnetic peaks were observed at incommensurate positions described by the ordering vector =(~1~0) with =0.678 at 4~K. This ordering vector is close to the commensurate one with =(2/3~1~0) reported earlier, but clearly deviates. The incommensurate nature of the magnetic order in GdCu is further corroborated by the peak shift with temperature below .