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

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

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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Category:Physics, Multidisciplinary

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