研究者詳細 - 摂待　力生

MISC - 摂待　力生

分割表示 1,079 件中 581 - 600 件目／全件表示 >>

19aPS-12 Ce_2PdGe_6の単結晶育成と磁性(領域8ポスターセッション(f電子系等I),領域8(強相関系 : 高温超伝導,強相関f電子系など))

木田遊, Thamizhavel Arumugamu, 竹内徹也, 摂待力生, 大貫惇睦

日本物理学会講演概要集 60 ( 2 ) 371 - 371 2005年8月

19aPS-18 小型高圧装置の開発とCe_2Ni_3Ge_5の量子臨界点近傍の物性(領域8ポスターセッション(f電子系等I),領域8(強相関系 : 高温超伝導,強相関f電子系など))

杉谷一朗, 中島美帆, Thamizhavel A., 奥田悠介, 摂待力生, 大貫惇睦

日本物理学会講演概要集 60 ( 2 ) 373 - 373 2005年8月

19aPS-9 CePt_3Siの磁性と超伝導に対する圧力効果(領域8ポスターセッション(f電子系等I),領域8(強相関系 : 高温超伝導,強相関f電子系など))

竹内徹也, 安田敬, 摂待力生, 大貫惇睦

日本物理学会講演概要集 60 ( 2 ) 371 - 371 2005年8月

21aYP-2 交流/直流帯磁率測定でみたCePt_3Siの二段超伝導転移(重い電子系超伝導(CePt_3Si, Cel15系),領域8(強相関系 : 高温超伝導,強相関f電子系など))

中辻景介, 住山昭彦, 小田祺景, 安田敬, 摂待力生, 大貫惇睦

日本物理学会講演概要集 60 ( 2 ) 480 - 480 2005年8月

20aYG-2 CeIn_3の圧力下^<115>In-NQRによる研究III(重い電子系超伝導他,領域8(強相関系 : 高温超伝導,強相関f電子系など))

川崎慎司, 北岡良雄, 水戸毅, 川崎祐, 小手川恒, 鄭国慶, 宍戸寛明, 荒木新吾, 摂待力生, 大貫惇睦

日本物理学会講演概要集 60 ( 2 ) 420 - 420 2005年8月

19pPSA-33 Smスクッテルダイト化合物の強磁場磁性(領域8ポスターセッション(f電子系統II),領域8(強相関系 : 高温超伝導,強相関f電子系など))

杉山清寛, 中島弘, 萩原政幸, 金道浩一, 菊池大輔, 青木勇二, 菅原仁, 佐藤英行, 摂待力生, 大貫惇睦, 播磨尚朝

日本物理学会講演概要集 60 ( 2 ) 401 - 401 2005年8月

21aYP-12 Ce_2RhIn_8の超伝導特性 : 圧力下NQR(重い電子系超伝導(CePt_3Si, Cel15系),領域8(強相関系 : 高温超伝導,強相関f電子系など))

宮崎弘士, 八島光晴, 川崎慎司, 北岡良雄, 宍戸寛明, 摂待力生, 大貫惇睦

日本物理学会講演概要集 60 ( 2 ) 482 - 482 2005年8月

21aYP-6 重い電子系超伝導体CeCoIn_5の熱ホール効果(重い電子系超伝導(CePt_3Si, Cel15系),領域8(強相関系 : 高温超伝導,強相関f電子系など))

笠原裕一, 仲島康行, 井澤公一, 松田祐司, Pehnia Kamran, 宍戸寛明, 摂待力生, 大貫惇睦

日本物理学会講演概要集 60 ( 2 ) 481 - 481 2005年8月

19pPSA-53 ジョセフソン効果を用いたCeIrIn_5の異方的超伝導の検証(領域8ポスターセッション(f電子系統II),領域8(強相関系 : 高温超伝導,強相関f電子系など))

住山昭彦, 辻善文, 小田祺景, 宍戸寛明, 摂待力生, 大貫惇睦

日本物理学会講演概要集 60 ( 2 ) 406 - 406 2005年8月

21aYP-11 CeRhIn_5の磁性と超伝導(一次相転移) : 圧力下^<115>In-NQRによる研究(重い電子系超伝導(CePt_3Si, Cel15系),領域8(強相関系 : 高温超伝導,強相関f電子系など))

八島光晴, 川崎慎司, 北岡良雄, 宍戸寛明, 摂待力生, 大貫惇睦

日本物理学会講演概要集 60 ( 2 ) 482 - 482 2005年8月

Single crystal growth and fermi surface properties of an antiferromagnet UPdGa5

S Ikeda, TD Matsuda, Y Haga, E Yamamoto, M Nakashima, S Kirita, TC Kobayashi, M Hedo, Y Uwatoko, H Yamagami, H Shishido, T Ueda, R Settai, Y Onuki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 74 ( 8 ) 2277 - 2281 2005年8月

記述言語：英語出版者・発行元：PHYSICAL SOC JAPAN

We have succeeded in growing a high-quality single crystal of an antiferromagnet UPdGa5 by the Ga-flux method with the off-stoichiometric composition of U : Pd : Ga = 1 : 2 : 7.3. The Neel temperature T-N = 30.5 K is found to increase with increasing the residual resistivity ratio (RRR) and becomes constant for a high-quality single crystal sample whose RRR is larger than 50. The electronic state has been investigated by the de Haas-van Alphen experiment, indicating the similar cylindrical Fermi surfaces as in an antiferromagnet UPtGa5. We have also studied the pressure effect by measuring the electrical resistivity. The Neel temperature decreases with increasing pressure and becomes zero at 3.1 GPa. The antiferromagnetic state is changed into the paramagnetic state above 3.1 GPa.

DOI： 10.1143/JPSJ.74.2277

Web of Science

researchmap

Itinerant 5f electrons and the Fermi surface properties in an enhanced Pauli paramagnet NpGe3

D Aoki, H Yamagami, Y Homma, Y Shiokawa, E Yamamoto, A Nakamura, Y Haga, R Settai, Y Onuki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 74 ( 8 ) 2149 - 2152 2005年8月

記述言語：英語出版者・発行元：PHYSICAL SOC JAPAN

We succeeded in growing a high-quality single crystal of an enhanced Pauli paramagnet, NpGe3, by the Bi-flux method, and observed the de Haas-van Alphen (dHvA) effect. The topology of a Fermi surface is well explained by the relativistic linear augmented-plane-wave (LAPW) band calculations based on the 5f itinerant band model. The Fermi surface consists of a nearly spherical electron-Fermi surface with necks along the (100) direction, forming a hollow ball, centered at the R point, which is derived from the single band. The cyclotron effective mass is in the range from 2.6 to 16m(o), which is enhanced approximately 3.5 times from the corresponding band:mass.

DOI： 10.1143/JPSJ.74.2149

Web of Science

researchmap

Magnetic and electrical properties of NpTGa5 (T = Fe, Rh and Ni)

D Aoki, Y Homma, Y Shiokawa, H Sakai, E Yamamoto, A Nakamura, Y Haga, R Settai, Y Onuki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 74 ( 8 ) 2323 - 2331 2005年8月

記述言語：英語出版者・発行元：PHYSICAL SOC JAPAN

We grew high-quality single crystals of NpTGa5 (T = Fe, Rh, and Ni) with a tetragonal structure by the Ga-flux method and measured their electrical resistivity, specific heat, magnetic susceptibility, and magnetization. All the investigated compounds undergo magnetic ordering. NpFeGa5 orders antiferromagnetically at T-N = 118 K and shows another magnetic transition at T* = 78 K. A relatively large electrical resistivity indicates that NpFeGa5 might be a low-carrier compound. NpRhGa5 also orders antiferromagnetically at T-N1 = 36 K. Below another magnetic transition at T-N2 = 32 K, the antiferromagnetic easy-axis is most likely changed from [001] to the (001) plane. On the other hand, NpNiGa5 undergoes ferromagnetic ordering at T-C = 30 K, where the magnetic moment of Np is directed along the [001] direction. Furthermore, below another magnetic transition at T* = 18 K, the ordered moment is discontinuously enlarged and a change of the magnetic structure occurs. The electronic specific heat coefficients are approximately determined as 30, 52, and 100mJ/K(2.)mol for NpFeGa5, NpRhGa5, and NpNiGa5, respectively. The magnetic susceptibility approximately follows the Curie-Weiss law at high temperatures (250 < T < 300K) with effective magnetic moments ranging from 2.4 to 2.6 mu(B)/Np for NpRhGa5 and NpNiGa5, indicating that the localized 5f(4) electronic states are most likely applicable to these compounds at high temperatures.

DOI： 10.1143/JPSJ.74.2323

Web of Science

researchmap

CeRhIn5とCeCoIn5の圧力下ドハース・ファンアルフェン効果と量子臨界点で変貌する4f電子状態

宍戸寛明, 摂待力生, 大貫惇睦

固体物理 40 ( 8 ) 573 - 580 2005年8月

Bulk-sensitive photoemission spectroscopy for heavy-fermion Pr compounds using hard x-ray

A Yamasaki, S Imada, A Sekiyama, M Tsunekawa, C Dallera, L Braicovich, TL Lee, H Sugawara, H Sato, R Settai, Y Onuki, S Suga

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 74 ( 7 ) 2045 - 2051 2005年7月

記述言語：英語出版者・発行元：PHYSICAL SOC JAPAN

Bulk-sensitive photoemission spectroscopy using hard x-ray up to h nu = 5450 eV has been performed for heavy-fermion Pr compounds. A significant spectral intensity of the |3(9)4f(3)> final state was observed in Pr 3d core-level spectra of PrFe4P12 at both h nu = 2450 and 5450 eV. The spectra obtained by the configuration-interaction cluster model calculation reproduce the experimental spectra for well-hybridized PrFe4P1, and localized Pr metal. Results of the calculations suggest that the Kondo behavior observed in PrFe4P12 arise from the mixing of the |4f(2)> and |4f(3)> configurations due to the c-f hybridization. Whereas a contribution possibly from a disordered surface to the spectrum can be the fractured PrFe4P12, they cannot be disregarded for the scraped PrSn3 and Pr metal even negligible for the in the high-energy x-ray region.

DOI： 10.1143/JPSJ.74.2045

Web of Science

researchmap

A change of electronic state tuned by pressure: pressure-induced superconductivity of the antiferromagnet Ce2Ni3Ge5

M Nakashima, H Kohara, A Thamizhavel, TD Matsuda, Y Haga, M Hedo, Y Uwatoko, R Settai, Y Onuki

JOURNAL OF PHYSICS-CONDENSED MATTER 17 ( 28 ) 4539 - 4546 2005年7月

記述言語：英語出版者・発行元：IOP PUBLISHING LTD

We measured the electrical resistivity of an antiferromagnet Ce2Ni3Ge5 with the orthorhombic crystal structure under pressure. The Neel temperature T-N = 5.2 K decreases with increasing pressure P and becomes zero at a critical P-c similar or equal to 3.9 GPa. The A and rho(0) values of the low-temperature electrical resistivity rho = rho(0) + AT(2) in the Fermi liquid relation increase steeply above 3 GPa. A value of A = 10.7 mu Omega cm K-2 at 3.9 GPa is comparable to A = 10 mu Omega cm K-2 in a heavy fermion superconductor CeCu2Si2. The heavy fermion state was found to be formed around P, in which pressure region superconductivity was found below 0.26 K.

DOI： 10.1088/0953-8984/17/28/012

Web of Science

researchmap

High-field magnetization in Pr-based filled skutterudite compounds PrFe4P12 and PrOs4Sb12

K Sugiyama, N Nakamura, T Yamamoto, D Honda, Y Aoki, H Sugawara, H Sato, T Takeuchi, R Settai, K Kindo, Y Onuki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 74 ( 5 ) 1557 - 1560 2005年5月

記述言語：英語出版者・発行元：PHYSICAL SOC JAPAN

High-field magnetization measurements have been performed on the filled skutterudite compounds PrFe4P12 and PrOs4Sb12 with the cubic crystal structure. Magnetization curves along the main symmetry axes of PrFe4P12 show clear anisotropy at high fields. On the basis of this result, we discuss the possible crystalline electric field (CEF) scheme in PrFe4P12 which reproduce the anisotropic feature at high magnetic fields. On the other hand, the magnetization of PrOS4Sb12 for H parallel to (100) at 0.1 K shows weak anomalies at 4.5 and 15T, which correspond to the phase boundaries of the field-induced anti ferroquadrupolar ordering phase. The observed magnetization curve is well explained by the CEF scheme determined by the previous neutron scattering experiments.

DOI： 10.1143/JPSJ.74.1557

Web of Science

researchmap

Electrical and magnetic properties of a single crystal UCu2Si2

TD Matsuda, Y Haga, S Ikeda, A Galatanu, E Yamamoto, H Shishido, M Yamada, J Yamaura, M Hedo, Y Uwatoko, T Matsumoto, T Tada, S Noguchi, T Sugimoto, K Kuwahara, K Iwasa, M Kohgi, R Settai, Y Onuki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 74 ( 5 ) 1552 - 1556 2005年5月

記述言語：英語出版者・発行元：PHYSICAL SOC JAPAN

We have succeeded in growing a high-quality single crystal of UCu2Si2 with the tetragonal structure by the Sn-flux method and measured the electrical resistivity, magnetic susceptibility, magnetization and specific heat. UCu2Si2 is found to order anti ferromagnetically below T-N = 106K, and follows a successive ferromagnetic ordering at T-C = 100 K. The magnetic properties are highly anisotropic, reflecting the crystal structure. An easy-axis of magnetization is found to be the [001] direction (c-axis) both in the antiferromagnetic and ferromagnetic phases, while the [100] direction (a-axis) corresponds to the hard-axis in magnetization. The magnetization curve in the antiferromagnetic phase indicates a clear metamagnetic transition at a low field of about 1 kOe and changes into a ferromagnetic magnetization curve below T-C = 100 K. The saturation moment is determined as 1.75 mu(B)/U at 2 K. The electronic specific heat coefficient is also determined as 20 mJ/(K(2.)mol).

DOI： 10.1143/JPSJ.74.1552

Web of Science

researchmap

Quasi-two-dimensional Fermi surfaces in the flat antiferromagnetic Brillouin zone of NpRhGa5 studied by dHvA experiments and energy band calculations

D Aoki, H Yamagami, Y Homma, Y Shiokawa, E Yamamoto, A Nakamura, Y Haga, R Settai, Y Onuki

JOURNAL OF PHYSICS-CONDENSED MATTER 17 ( 17 ) L169 - L175 2005年5月

記述言語：英語出版者・発行元：IOP PUBLISHING LTD

We succeeded in growing a high-quality single crystal of NpRhGa5 by the Ga-flux method and observed the de Haas-van Alphen oscillation in the antiferromagnetic state. Four kinds of nearly cylindrical Fermi surfaces, which correspond to main Fermi surfaces, were clearly detected. These quasi-two-dimensional Fermi surfaces are formed in the flat antiferromagnetic Brillouin zone and are well explained on the basis of spin- and orbital-polarized LAPW energy band calculations. The cyclotron masses are moderately enhanced, ranging from 8.1 to 11.7 m(0), which are approximately four times larger than the corresponding band masses. This is the first case where the 5f-itinerant band model is applicable to a neptunium magnetic compound.

DOI： 10.1088/0953-8984/17/17/L03

Web of Science

researchmap

Novel superconductivity in noncentrosymmetric heavy-fermion compound CePt3Si: a Pt-195-NMR study

M Yogi, Y Kitaoka, S Hashimoto, T Yasuda, R Settai, TD Matsuda, Y Haga, Y Onuki, P Rogl, E Bauer

PHYSICA B-CONDENSED MATTER 359 389 - 391 2005年4月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE BV

We report on a (195)pt-NMR study of the antiferromagnetic heavy-fermion (HF) superconductor CePt3Si without an inversion center. The measurements of the nuclear spin-lattice relaxation rate 1/T-1 has revealed a uniform coexistence of anti ferromagnetism and superconductivity. CePt3Si is the first HF superconductor that reveals a peak in 1/T-1 just below T-c and, additionally, does not follow the T-3 law that was observed for most unconventional HF superconductors. We remark that this unexpected superconducting characteristic may be related to the lack of an inversion center in its crystal structure. (c) 2005 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physb.2005.01.072

Web of Science

researchmap

　前のページ - 次のページ　

<摂待 力生>

MISC - 摂待 力生

<摂待　力生>

MISC - 摂待　力生