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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:82.43(Physics, Multidisciplinary)no abstracts in English
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:81.07(Physics, Multidisciplinary)We succeeded in growing a high-quality single crystal of an antiferromagnet UPtGa 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
10
to 1.13
10
Oe. Fermi surfaces consist of two nearly cylindrical and two spherical Fermi surfaces. The cyclotron mass is large, ranging from 10 to 24
, which is consistent with the electronic specific heat coefficient
= 57 mJ/K
mol.
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:84.29(Physics, Multidisciplinary)The crystal and magnetic structures of 5 itinerant antiferromagnets UNiGa
and UPtGa
were studied by means of neutron scattering. The powder diffraction data were well explained by the HoCoGa
tetragonal structure with space group P4/mmm. In UNiGa
uranium spins in the simple tetragonal lattice has the N
el-type structure with a relatively large moment of 0.9,
/U along the [0,0,1] direction. On the other hand, magnetic moments of uranium atoms in UPtGa
are aligned ferromagnetically in the (0,0,1) plane and are directed along the [0,0,1] direction in an antiferromagnetic sequence (
). An ordered moment is 0.24,
/U. The nearest-neighbor interaction might be different in these isostructural compounds.