Single-crystal growth and magnetic properties of a new ternary uranium compound U3Ni5Al19

✍ Scribed by Yoshinori Haga; Tatsuma D. Matsuda; Shugo Ikeda; Andrei Galatanu; Takuya Matsumoto; Toyonari Sugimoto; Toshiji Tada; Satoru Noguchi; Yoshichika Ōnuki

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 219 KB
• Volume: 359-361
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2005.01.379

✦ Synopsis

A new ternary uranium-based intermetallic compound U 3 Ni 5 Al 19 has been synthesized. It crystallizes in the unique flat orthorhombic structure. Uranium atoms occupy two crystallographic 4c and 8f sites of quite similar local chemical environments. The temperature dependence of the magnetic susceptibility wðTÞ demonstrates peculiar magnetic anisotropy; wðTÞ along the b-and c-axis obeys the Curie-Weiss law above 23 K, while wðTÞ along a-axis is small and temperature independent. At 23 K, only w c shows a sharp cusp corresponding to an antiferromagnetic ordering, while w b remains paramagnetic down to 2 K. From the crystallographical structure we suggest that only uranium atoms at the 8c site order antiferromagnetically at T N ¼ 23 K; while those occupying the 4c site do not order down to 50 mK.