Neutron powder diffraction experiments on the layered triangular-lattice antiferromagnets RbFe(MoO) and CsFe(SO)

層状三角格子反強磁性体RbFe(MoO)とCsFe(SO)の中性子回折実験

稲見 俊哉

Inami, Toshiya

層状三角格子反強磁性体RbFe(MoO)とCsFe(SO)の粉末試料を作成し、粉末中性子回折実験を行って磁気構造を決めた。どちらの化合物も磁気構造は三角面内は、いわゆる120度構造で、面間は非整合構造であった。秩序モーメントはab面内にあった。RbFe(MoO)については190Kでからへの結晶構造変化も見いだした。

Powder specimens of the layered triangular lattice antiferromagnets RbFe(MoO) and CsFe(SO) were prepared and neutron powder diffraction experiments were carried out in order to determine the magnetic structure. Magnetic structure of both compounds is so-called 120 structure in the triangular plane and incommensurate between the plane. The ordered moments are confined in the basal -plane. It is also found that RbFe(MoO) shows structural phase transition at around 190 K from to .