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Journal Articles

Resonant X-ray scattering study of UNiGa$$_5$$

Kuzushita, Kaori; Ishii, Kenji; Owada, Kenji; Murakami, Yoichi; Kaneko, Koji; Metoki, Naoto; Lander, G. H.; Ikeda, Shugo; Haga, Yoshinori; Onuki, Yoshichika

Physica B; Condensed Matter, 359-361, p.1045 - 1047, 2005/04

https://doi.org/10.1016/j.physb.2005.01.419
 Times Cited Count：2 Percentile：11.64(Physics, Condensed Matter)

In UNiGa$$_5$$ which shows antiferromagnetic ordering below $textit{T$_N$}$ = 86 K with 0.75 $$mu_B$$/U, we observed resonant magnetic reflections using synchrotron X-ray tuned the incident photon energy near M$$_4$$-edge of U and K-edge of Ga, and the large enhancement about 10$$^2$$ at just resonant energy of Ga K-edge although Ga is a nonmagnetic element. It is considered that the origin of the magnetic resonant scattering intensity at Ga K-edge is the Ga-4$textit{p}$ orbital polarization induced by the 5$textit{f}$ orbital polarization at the neighboring U atom due to the hybridization.

Journal Articles

Neutron scattering study of the crystal and magnetic structures in itinerant-5$$f$$ antiferromagnets UNiGa$$_5$$ and UPtGa$$_5$$

Tokiwa, Yoshifumi; Haga, Yoshinori; Metoki, Naoto; Ishii, Yoshinobu; Onuki, Yoshichika

Journal of the Physical Society of Japan, 71(3), p.725 - 728, 2002/03

https://doi.org/10.1143/JPSJ.71.725
 Times Cited Count：49 Percentile：84.3(Physics, Multidisciplinary)

The crystal and magnetic structures of 5$$f$$ itinerant antiferromagnets UNiGa$$_5$$ and UPtGa$$_5$$ were studied by means of neutron scattering. The powder diffraction data were well explained by the HoCoGa$$_5$$ tetragonal structure with space group P4/mmm. In UNiGa$$_5$$ uranium spins in the simple tetragonal lattice has the N$'e$el-type structure with a relatively large moment of 0.9,$$mu_{rm B}$$/U along the [0,0,1] direction. On the other hand, magnetic moments of uranium atoms in UPtGa$$_5$$ are aligned ferromagnetically in the (0,0,1) plane and are directed along the [0,0,1] direction in an antiferromagnetic sequence ($$uparrowdownarrow$$). An ordered moment is 0.24,$$mu_{rm B}$$/U. The nearest-neighbor interaction might be different in these isostructural compounds.

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