Faculty Profiles - TAKEDA Naoya

Papers - TAKEDA Naoya

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Effect of Pressure on Specific Heat of Kondo Lattice System Ce_3Pd_<20>Si_6

Hashiguchi T., Takeda N., Kitagawa J., Wada N., Takayanagi S., Ishikawa M., Mori N.

Meeting Abstracts of the Physical Society of Japan 1995 155 - 155 1995

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). Reviewed

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

J. Chem. Soc., Chem. Commun. 1723 1994.12

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

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

Chemistry Letters 29 - 32 1994.12

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

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

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

Physica B: Physics of Condensed Matter 186-188 ( C ) 153 - 155 1993.5

Language：English Publishing type：Research paper (scientific journal)

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 1993.5

Language：English Publishing type：Research paper (scientific journal) Publisher：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 Reviewed

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

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

Language：English Publishing type：Research paper (scientific journal)

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 Reviewed

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

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

Language：English Publishing type：Research paper (scientific journal)

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 Reviewed

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

Language：English Publishing type：Research paper (scientific journal)

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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DHVA EFFECT IN F-ELECTRON SYSTEMS Reviewed

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 1990.12

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

dHvA magnetization of U3P4 and YbAs has been measured. The measurement for U3P4 in the {1 1 0} plane shows a new branch. We have observed the dHvA effect in YbAs for the first time. The observed branches consist of ellipsoids of electron sheets. These sheets do not change its shape above and below T(N).

DOI： 10.1016/S0304-8853(10)80152-0

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Papers - TAKEDA Naoya