Unique magnetic properties of NdRhIn, TbRhIn, DyRhIn, and HoRhIn

NdRhIn, TbRhIn, DyRhIn及びHoRhInの特異な磁気特性

Hieu, N. V.*; 宍戸 寛明*; 竹内 徹也*; Thamizhavel, A.*; 中島 弘*; 杉山 清寛*; 摂待 力生*; 松田 達磨; 芳賀 芳範   ; 萩原 政幸*; 金道 浩一*; 大貫 惇睦

Hieu, N. V.*; Shishido, Hiroaki*; Takeuchi, Tetsuya*; Thamizhavel, A.*; Nakashima, Hiroshi*; Sugiyama, Kiyohiro*; Settai, Rikio*; Matsuda, Tatsuma; Haga, Yoshinori; Hagiwara, Masayuki*; Kindo, Koichi*; Onuki, Yoshichika

正方晶系NdRhIn, TbRhIn, DyRhIn及びHoRhInの単結晶育成に成功した。磁化率及び磁化測定を行った。NdRhInは反強磁性転移温度11.6Kで、この温度以下、かつ[001]方向において70kOeと93kOeの磁場でメタ磁性転移を示す。飽和磁気モーメントの大きさは、中性子実験から得られた値と良い一致を示している。TbRhIn, DyRhIn, HoRhInは、同じく反強磁性転移を示すが、これらの磁気特性はNdRhInによく似ている。これらの磁気構造を結晶構造と交換相互作用をもとにモデルを提案した。

We grew single crystals of NdRhIn, TbRhIn, DyRhIn, and HoRhIn with the tetragonal crystal structure and measured the magnetic susceptibility and magnetization. NdRhIn is an antiferromagnet with a Neel temperature = 11.6 K. Below , magnetization reveals two metamagnetic transitions at Hm1 = 70 kOe and Hm2 = 93 kOe for the magnetic field along the [001] direction. The saturation moment of 2.5 /Nd is in good agreement with the staggered Nd moment determined by the neutron diffraction experiment. These metamagnetic transitions correspond to the change of the magnetic structure. TbRhIn, DyRhIn and HoRhIn are found to be antiferromagnets with = 47.3, 28.1, and 15.8 K, respectively. The magnetization curves of these compounds are also quite similar to those of NdRhIn, revealing two metamagnetic transitions. The magnetic structures in magnetic fields are proposed by considering the exchange interactions based on the crystal structure.