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Journal Articles

Quasi-two dimensional electronic state of the antiferromagnet UPtGa$$_5$$

Ikeda, Shugo; Tokiwa, Yoshifumi*; Haga, Yoshinori; Yamamoto, Etsuji; Okubo, Tomoyuki*; Yamada, Mineko*; Nakamura, Noriko*; Sugiyama, Kiyohiro*; Kindo, Koichi*; Inada, Yoshihiko*; et al.

Journal of the Physical Society of Japan, 72(3), p.576 - 581, 2003/03

 Times Cited Count:41 Percentile:83.42(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Magnetic and Fermi surface properties of UPtGa$$_5$$

Tokiwa, Yoshifumi; Ikeda, Shugo*; Haga, Yoshinori; Okubo, Tomoyuki*; Iizuka, Tomoya*; Sugiyama, Kiyohiro*; Nakamura, Akio; Onuki, Yoshichika

Journal of the Physical Society of Japan, 71(3), p.845 - 851, 2002/03

 Times Cited Count:40 Percentile:82.33(Physics, Multidisciplinary)

We succeeded in growing a high-quality single crystal of an antiferromagnet UPtGa$$_5$$ by the self-flux method, and measured the magnetic susceptibility, electrical resistivity, specific heat and de Haas-van Alphen (dHvA) oscillation. We found an antiferromagnetic transition at 26K from the magnetic susceptibility and electrical resistivity measurements. Six dHvA branches were observed, ranging from 1.14$$times$$10$$^7$$ to 1.13$$times$$10$$^8$$ Oe. Fermi surfaces consist of two nearly cylindrical and two spherical Fermi surfaces. The cyclotron mass is large, ranging from 10 to 24 $$m_{rm 0}$$, which is consistent with the electronic specific heat coefficient $$gamma$$ = 57 mJ/K$$^2cdot$$mol.

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

 Times Cited Count:49 Percentile:85.06(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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