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Single-crystal growth and magnetic properties of a new ternary uranium compound U$$_3$$Ni$$_5$$Al$$_{19}$$

新しいウラン化合物U$$_3$$Ni$$_5$$Al$$_{19}$$の単結晶育成と磁性

芳賀 芳範 ; 松田 達磨; 池田 修悟; Galatanu, A.; 松本 拓也*; 杉本 豊成*; 多田 俊治*; 野口 悟*; 大貫 惇睦

Haga, Yoshinori; Matsuda, Tatsuma; Ikeda, Shugo; Galatanu, A.; Matsumoto, Takuya*; Sugimoto, Toyonari*; Tada, Toshiji*; Noguchi, Satoru*; Onuki, Yoshichika

新しいウラン化合物U$$_3$$Ni$$_5$$Al$$_{19}$$を発見し、単結晶育成に成功した。斜方晶の結晶構造を有し、ウランは結晶学的に2つのサイトを占める。磁化の異方性から、そのうち一つのサイトのウランだけが反強磁性秩序を起こし、もう一つのウランは低温まで常磁性状態にあると考えられる。

A new ternary uranium-based intermetallic compound U$$_3$$Ni$$_5$$Al$$_{19}$$ has been symthesized. It crystallizes in the unique flat orthorhombic structure. Uranium atoms occupy two crystallographic 4$$c$$ and 8$$f$$ sites where local chemical environments are quite similar. The temperature dependence of the magnetic susceptibility $$chi(T)$$ demonstrates peculiar magnetic anisotropy; $$chi(T)$$ along $$b$$- and $$c$$-axes obeys the Curie-Weiss law above 23 K, while $$chi(T)$$ along $$a$$-axis is small and temperature independent. At 23 K, only $$chi_c$$ shows a sharp cusp corresponding to the antiferromagnetic ordering, while $$chi_b$$ remains paramagnetic behavior down to 2 K. These results and crystallographical considerations lead to a conclusion that only uranium atoms at the 8$$c$$ site order antiferromagnetically at $$T_{rm N}$$ = 23 K, while uranium atoms at the $$4c$$ site do not order down to 50 mK.

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パーセンタイル:12.3

分野:Physics, Condensed Matter

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