研究者詳細 - 武田　直也

論文 - 武田　直也

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近藤格子系Ce_3Pd_<20>Si_6の比熱の圧力効果

橋口強, 武田直也, 北川二郎, 和田信雄, 高柳滋, 石川征靖, 毛利信男

日本物理学会講演概要集. 秋の分科会 1995 155 - 155 1995年

An Organic Ferromagnet:alpha-Phase Crystal of 2 - (2', 5' - Dihydroxyphenyl) - 4, 4, 5, 5 - tetramethyl - 4, 5 - dihydro - 1H - imidazolyl - 1 - oxy - 3 - oxide (alpha- HQNN). 査読

T. Sugawara, M. M. Matsushita, A. Izuoka, N. Wada, N. Takeda, M. Ishikawa

J. Chem. Soc., Chem. Commun. 1723 1994年12月

A New Organic Ferromagnet : 4 - Benzylideneamino - 2, 2, 6, 6 - tetramethylpiperidin - 1 - oxyl. 査読

T. Nogami, K. Tomioka, T. Ishida, H. Yoshiika, M. Yasui, F. Iwasaki, H. Iwamura, N. Takeda, M. Ishikawa

Chemistry Letters 29 - 32 1994年12月

An Organic Ferromagnet with a Tc of 0.4K. 4-(p-Phenylbenzylideneamino)-2,2,6,6-tetramethylpiperidin-1-oxyl

T. Ishida, H. Tsuboi, T. Nogami, H. Yoshikawa, M. Yasui, F. Iwasaki, H. Iwamura, N. Takeda, M. Ishikawa

Chem. Lett. 1994 ( 5 ) 919 - 922 1994年

Fermi surface and cyclotron mass of extremely low carrier system CeAs 査読

N. Takeda, Y. S. Kwon, Y. Haga, N. Sato, T. Suzuki, T. Komatsubara

Physica B: Physics of Condensed Matter 186-188 ( C ) 153 - 155 1993年5月

記述言語：英語掲載種別：研究論文（学術雑誌）

The Fermi surface and the cyclotron mass of a semimetallic compound, CeAs, were determined by use of the dHvA effect. We have found that the cyclotron mass of the hole surface decreases with increasing field. CeAs is a dense Kondo system with low carrier concentration of 0.0024/formula unit. © 1993.

DOI： 10.1016/0921-4526(93)90520-G

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PHYSICAL-PROPERTIES OF UPD2AL3 AT LOW-TEMPERATURE

T SAKON, K IMAMURA, N TAKEDA, N SATO, T KOMATSUBARA

PHYSICA B-CONDENSED MATTER 186-88 297 - 299 1993年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE BV

We have measured specific heat, magnetic susceptibility and electrical resistivity of UPd2Al3 and UPd2Al3.03 single crystals. The temperature dependence of the specific heat of UPd2Al3 reveals that the superconducting gap function is anisotropic. We present the results of specific heat measurements of UPd2Al3.03, suggesting an additional phase transition around 0.6 K.

DOI： 10.1016/0921-4526(93)90559-O

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Heavy-Electron Behavior in a Low-Carrier-Concentration Compound YbAs 査読

Takuo Sakon, Noriaki Sato, Akira Oyamada, Naoya Takeda, Takashi Suzuki, Takemi Komatsubara

Journal of the Physical Society of Japan 61 ( 7 ) 2209 - 2211 1992年

記述言語：英語掲載種別：研究論文（学術雑誌）

Low-temperature specific heat of YbAs has been measured down to about 50 mK. In the antiferromagnetic ordered state (TN∼0.5 K), the nuclear contribution is observed below about 150 mK. By subtraction of this contribution from the measured specific heat, the linear coefficient of the electronic specific heat is estimated to be about 270 mJ/K2 mole. This value is extraordinarily large because the carrier concentration in YbAs is of the order of 0.01 per formula unit. This large mass enhancement may be ascribed to a mutual 4f-spin compensation mechanism instead of the usual Kondo spin fluctuation. We also show that the magnetic field effect on the specific heat is rather small. © 1992, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.

DOI： 10.1143/JPSJ.61.2209

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Anisotropy in a Heavy Fermion Superconductor: UPd2Al3 査読

Noriaki Sato, Takuo Sakon, Naoya Takeda, Takemi Komatsubara, Christoph Geibel, Frank Steglich

Journal of the Physical Society of Japan 61 ( 1 ) 32 - 34 1992年

記述言語：英語掲載種別：研究論文（学術雑誌）

We report on the anisotropy of magnetization, electrical resistivity and upper critical magnetic fields (HC2) of UPd2Al3. The magnetization curve in the antiferromagnetically ordered state shows large anisotropy, indicating that the sublattice moments lie in the basal hexagonal plane. The value of 1(dHC2/dT) at Tc is estimated to be about 36 (kOe/K) for the magnetic field parallel and perpendicular to the hexagonal c-axis, and the upper critical field seems to be rather isotropic. © 1992, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.

DOI： 10.1143/JPSJ.61.32

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A New Mass-Enhanced Ferromagnet: U2PtSi3 査読

Noriaki Sato, Masaki Kagawa, Katsunori Tanaka, Naoya Takeda, Takeo Satoh, Shinichi Sakatsume, Takemi Komatsubara

Journal of the Physical Society of Japan 60 ( 3 ) 757 - 759 1991年

記述言語：英語掲載種別：研究論文（学術雑誌）

We have newly found and succeeded in growing a mass-enhanced ferromagnet U2PtSi3. The electronic specific heat coefficient is 200 mJ/K2 per mole of U. The magnetization shows no saturation up to 80 kOe for both the a- and c-axes. The magnitude of remanence is much smaller compared with the effective moment in the paramagnetic phase. Experimental results on single-crystalline samples are presented and discussed. © 1991, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.

DOI： 10.1143/JPSJ.60.757

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f電子系におけるdHvA効果査読

N. Takeda, M. Kagawa, K. Tanaka, A. Oyamada, N. Sato, S. Sakatsume, T. Suzuki, T. Komatsubara

Journal of Magnetism and Magnetic Materials 90-1 425 - 427 1990年12月

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