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Kato, Harukazu; Sakai, Hironori; Kambe, Shinsaku; Walstedt, R. E.; Tokiwa, Yoshifumi; Onuki, Yoshichika
Acta Physica Polonica B, 34(2), p.1063 - 1066, 2003/09
We performed Ga-NMR/NQR studies for UPtGa
, which is a 5
-itinerant antiferromagnets with Neel temperature
= 26 K and an electronic specific coefficient
= 57 mJ/mol K
. From the NMR spectrum in the paramagnetic temperature region, the hyperfine coupling constants
in the paramagnetic state have been evaluated. The magnitude of the transferred field has been evaluated from the zero-applied-field spectrum, yielding a value for the hyperfine coupling constant
in the antiferromagnetic state. The estimated value of
is an order of magnitude larger than that of
. This implies the existence of a long-ranged hyperfine interaction path. The mechanism of the hyperfine interaction will be discussed in terms of RKKY interactions.
Metoki, Naoto; Koike, Yoshihiro; Haga, Yoshinori; Bernhoeft, N.*; Lander, G. H.*; Tokiwa, Yoshifumi; Onuki, Yoshichika
Acta Physica Polonica B, 34(2, Part2), p.979 - 982, 2003/02
no abstracts in English
Okane, Tetsuo; Fujimori, Shinichi; Mamiya, Kazutoshi; Okamoto, Jun; Fujimori, Atsushi; Tsujii, Naoto*; Yoshimura, Kazuyoshi*
Acta Physica Polonica B, 34(2), p.1019 - 1022, 2003/02
no abstracts in English
Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika; Nakashima, Miho*; Aoki, Dai*; Onuki, Yoshichika*; Hedo, Masato*; Uwatoko, Yoshiya*
Acta Physica Polonica B, 34(2), p.1239 - 1242, 2003/02
Uranium intermetallic compounds UX (X = Si, Ge, Sn, Pb) form a ariety of magnetic properties including Pauli paramagnetism in USi
and UGe
, spin fluctuations in USn
and antiferromagnetism in UPb
. Among them, UPb
is an antiferromagnet below the N
el temperature 32 K with a large electronic specific heat
= 110 mJ/K
mol. In this study we present the electrical resistivity measurement under high pressure up to 8 GPa. We found that at low pressure
increases with increasing pressure. It has a maximum value 36 K at 3 GPa, then decreases with increasing pressure.In addition we observed an additional resistive anomaly followed by a steep decrease in resistivity below
under pressure.The maximum pressure 8 GPa in the present study was not enough to suppress the antiferromagnetic transition.The critical pressure is estimated to be around 12 GPa.
Osakabe, Toyotaka; Hannan, A.*; Kawana, Daichi*; Kogi, Masafumi*; Kitazawa, Hideaki*
Acta Physica Polonica B, 34(2), p.1469 - 1472, 2003/02
no abstracts in English
Araki, Shingo; Nakashima, Miho*; Settai, Rikio*; Kobayashi, Tatsuo*; Onuki, Yoshichika
Acta Physica Polonica B, 34(2, Part1), p.439 - 442, 2003/02
no abstracts in English
Matsuda, Tatsuma; Haga, Yoshinori; Tokiwa, Yoshifumi; Andrei, G.; Yamamoto, Etsuji; Okubo, Tomoyuki*; Onuki, Yoshichika
Acta Physica Polonica B, 34(2), p.1071 - 1074, 2003/02
We have successfully grown a single crystal of uranium intermetallic compound URhGe. The temperature dependence of electrical resistivity shows highly anisotropic behavior. Two anomalies, which correspond to the magnetic ordering temperatures, were observed in the resistivity, magnetic susceptibility and specific heat measurements at
= 30 K and
=25 K. The magnetic susceptibility also shows a large uniaxial anisotropy with a magnetic easy-axis along the [010] direction.
Kimura, Akihiro; Yokoyama, Kaoru; Takeda, Shinji; Kodama, Shinichi
Acta Physica Polonica B, 34(2), p.1465 - 1468, 2003/00
None
Yamamoto, Etsuji; Haga, Yoshinori; Matsuda, Tatsuma; Inada, Yoshihiko*; Settai, Rikio*; Tokiwa, Yoshifumi*; Onuki, Yoshichika
Acta Physica Polonica B, 34(2), p.1059 - 1062, 2003/00
no abstracts in English