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Magnetic and Fermi surface properties in ferromagnets NdRh$$_3$$B$$_2$$ and GdRh$$_3$$B$$_2$$

強磁性体NdRh$$_3$$B$$_2$$及びGdRh$$_3$$B$$_2$$の磁気特性とフェルミ面

大開 美子*; 中島 弘*; Galatanu, A.*; 松田 達磨; 芳賀 芳範   ; 竹内 徹也*; 杉山 清寛*; 金道 浩一*; 萩原 政幸*; 摂待 力生*; 播磨 尚朝*; 大貫 惇睦

Obiraki, Yoshiko*; Nakashima, Hiroshi*; Galatanu, A.*; Matsuda, Tatsuma; Haga, Yoshinori; Takeuchi, Tetsuya*; Sugiyama, Kiyohiro*; Kindo, Koichi*; Hagiwara, Masayuki*; Settai, Rikio*; Harima, Hisatomo*; Onuki, Yoshichika

六方晶,強磁性体NdRh$$_3$$B$$_2$$及びGdRh$$_3$$B$$_2$$の単結晶育成に成功し、電気抵抗率,比熱,磁化率,磁化測定を行った。それぞれの強磁性転移温度及び磁気モーメントの大きさを明らかにした。NdRh$$_3$$B$$_2$$については、結晶場レベルスキームのモデルを実験結果から提唱し、さらドハース・ファンアルフェン効果測定からフェルミ面を明らかにし、LaRh$$_3$$B$$_2$$に似た、準1次元的な電子状態であることを明らかにした。

We succeeded in growing single crystals of ferromagnets NdRh$$_3$$B$$_2$$ and GdRh$$_3$$B$$_2$$ with the hexagonal structure, and measured the electrical resistivity, specific heat, magnetic susceptibility and magnetization. From these measurements, the Curie temperature $$T_C$$ is determined as $$T_C$$=10.2 K in NdRh$$_3$$B$$_2$$ and TC=93 K in GdRh$$_3$$B$$_2$$. The magnetic moments of about 2.5 $$mu_B$$ in NdRh$$_3$$B$$_2$$ and 7.7 $$mu_B$$ in GdRh$$_3$$B$$_2$$ are oriented in the basal plane. The crystalline electric field scheme is proposed for NdRh$$_3$$B$$_2$$ on the basis of the experimental results of Schottky anomaly in the specific heat and anisotropic susceptibility and magnetization. The Fermi surface in NdRh$$_3$$B$$_2$$ is very similar to that in a non-4 f reference compound LaRh$$_3$$B$$_2$$, possessing the quasi-one dimensional electronic character.

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パーセンタイル:32.33

分野:Physics, Multidisciplinary

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