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Journal Articles

Electrical and magnetic properties of a single crystal UCu$$_2$$Si$$_2$$

Matsuda, Tatsuma; Haga, Yoshinori; Ikeda, Shugo; Galatanu, A.; Yamamoto, Etsuji; Shishido, Hiroaki*; Yamada, Mineko*; Yamaura, Junichi*; Hedo, Masato*; Uwatoko, Yoshiya*; et al.

Journal of the Physical Society of Japan, 74(5), p.1552 - 1556, 2005/05

https://doi.org/10.1143/JPSJ.74.1552
 Times Cited Count：26 Percentile：72.53(Physics, Multidisciplinary)

We have succeeded in growing a high-quality single crystal of UCu$$_2$$Si$$_2$$ with the tetragonal structure by the Sn-flux method and measured the electrical resistivity, magnetic susceptibility, magnetization and specific heat. UCu$$_2$$Si$$_2$$ is found to order antiferromagnetically below $$T_{rm N}$$ = 106 K, and follows a successive ferromagnetic ordering at $$T_{rm C}$$ = 100 K. The magnetic properties are highly anisotropic, reflecting the crystal structure. An easy-axis of magnetization is found to be the [001] direction ($$c$$-axis) both in the antiferromagnetic and ferromagnetic phases, while the [100] direction ($$a$$-axis) corresponds to the hard-axis in magnetization. The magnetization curve in the antiferromagnetic phase indicates a clear metamagnetic transition at a low field of about 1 kOe and changes smoothly into a ferromagnetic magnetization curve below $$T_{rm C}$$ = 100 K. The saturation moment is determined as 1.75$$mu_{rm B}$$/U at 2 K. The electronic specific heat coefficient is also determined as 20 mJ/K$$^2$$$$cdot$$mol.

Journal Articles

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

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

Physica B; Condensed Matter, 359-361, p.1006 - 1008, 2005/04

https://doi.org/10.1016/j.physb.2005.01.379
 Times Cited Count：3 Percentile：16.01(Physics, Condensed Matter)

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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