研究者詳細 - 摂待　力生

MISC - 摂待　力生

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25pSD-4 Sr_2RuO_4の超音波吸収 : 三重項超伝導の検証

松井広志, 吉田良行, 向井厚史, 摂待力生, 大貫惇睦, 武居文彦, 木村憲彰, 青木晴善, 豊田直樹

日本物理学会講演概要集 55 ( 2 ) 553 - 553 2000年9月

23pSE-8 UIrの単結晶育成と物性

山本悦嗣, 芳賀芳範, 常盤欣文, 中村彰夫, 摂待力生, 青木大, 大貫惇睦

日本物理学会講演概要集 55 ( 2 ) 510 - 510 2000年9月

22pSE-3 PrSn_3の高圧下磁性

石塚守, 遠藤将一, 竹内徹也, 摂待力生, 大貫惇睦

日本物理学会講演概要集 55 ( 2 ) 442 - 442 2000年9月

22pPSA-25 重い電子系超伝導体UPd_2Al_3の異方性

天谷健一, 網塚浩, 榊原俊郎, 山本悦嗣, 芳賀芳範, 稲田佳彦, 摂待力生, 大貫惇睦

日本物理学会講演概要集 55 ( 2 ) 456 - 456 2000年9月

22pPSA-73 Shubnikov-de Haas effect in UP_2

Onuki Y., Wisniewski P., Aoki D., Inada Y., Settai R., Haga Y., Yamamoto E.

日本物理学会講演概要集 55 ( 2 ) 468 - 468 2000年9月

25pSD-5 Sr_2Ru0_4の磁気音響量子振動 : 新しい吸収の波形異常

松井広志, 吉田良行, 向井厚史, 摂待力生, 大貫惇睦, 武居文彦, 木村憲彰, 青木晴善, 豊田直樹

日本物理学会講演概要集 55 ( 2 ) 553 - 553 2000年9月

22pPSA-67 SmSb_2のドハースファンアルフェン効果

渡邊なるみ, 村川政男, 飯塚知也, 不藤基樹, 青木大, 稲田佳彦, 摂待力生, 杉山清寛, 大貫惇睦

日本物理学会講演概要集 55 ( 2 ) 466 - 466 2000年9月

25pSD-11 Sr_2RuO_4の磁場侵入長の温度依存

中村崇市郎, 宮本泰久, 池上弘樹, 和田信雄, 吉田良行, 摂待力生, 大貫惇睦

日本物理学会講演概要集 55 ( 2 ) 554 - 554 2000年9月

充填スクッテルダイトREFe_4P_<12>のde Haas-van Alphen 効果

菅原仁, 松田達磨, 阿部敬介, 青木勇二, 佐藤英行, 野尻さやか, 稲田佳彦, 摂待力生, 大貫惇睦, 播磨尚朝

日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan 24 62 - 62 2000年9月

Magnetic and Fermi surface properties of the ferromagnetic compound UGa2

T Honma, Y Inada, R Settai, S Araki, Y Tokiwa, T Takeuchi, H Sugawara, H Sato, K Kuwahara, M Yokoyama, H Amitsuka, T Sakakibara, E Yamamoto, Y Haga, A Nakamura, H Harima, H Yamagami, Y Onuki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 69 ( 8 ) 2647 - 2659 2000年8月

記述言語：英語出版者・発行元：PHYSICAL SOC JAPAN

We have studied the magnetic and Fermi surface properties in a ferromagnet UGa2. The electrical resistivity, elastic constant, thermal expansion coefficient: thermoelectric power, magnetic susceptibility and Hall coefficient indicate highly anisotropic properties, reflecting the hexagonal-structure. The 5f(2)- and 5f(3)-CEF schemes, based on the localized 5f-electron nature, are discussed to understand the magnetic susceptibility and magnetization data. We have also done the magnetoresistance and de Haas-van Alphen (dHvA) experiments to investigate the Fermi surface properties. Both data are very complicated, implying that the Fermi surface is a multiply-connected one. They are explained neither by the localized 5f(2)- and 5f(3)-core models nor by the spin-polarized 5f-itinerant model. The cyclotron mass is, however, rather light, ranging from 0.17 to 6.2 m(0), which is consistent with the electronic specific heat coefficient of 11mJ/K-2.mol.

DOI： 10.1143/JPSJ.69.2647

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Cylindrical Fermi surfaces formed by a flat magnetic Brillouin zone in uranium dipnictides

D Aoki, P Wisniewski, K Miyake, N Watanabe, Y Inada, R Settai, E Yamamoto, Y Haga, Y Onuki

PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES 80 ( 8 ) 1517 - 1544 2000年8月

記述言語：英語出版者・発行元：TAYLOR & FRANCIS LTD

We succeeded in growing high-quality single crystals of UX2 (X = Bi, Sb, As or P) by the self-flux and chemical transport methods and carried out de Haas-van Alphen and Shubnikov-de Haas experiments. We found quasi-two-dimensional Fermi surfaces in these U compounds. Fermi surfaces of UBi2 are found to consist of one spherical Fermi surface and two cylindrical Fermi surfaces. Each Fermi surface in UBi2 changes into two cylindrical surfaces in USb2 and UAs2. This change in the Fermi surfaces is well explained on the basis of a flat magnetic Brillouin zone. The quasi-two-dimensional character of the Fermi surfaces is mainly due to the conduction electrons in the U plane, including the 5f electrons. The itinerant nature of 5f electrons is reflected in the large cyclotron masses. The magnetic breakthrough (breakdown) phenomenon is also discussed for USb2.

DOI： 10.1080/01418630050114718

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AC susceptibility measurements on heavy fermion compounds CeCu6 and CeNi down to submillikelvin temperatures

H Tsujii, E Tanaka, T Mamiya, S Araki, R Settai, Y Onuki

PHYSICA B 284 1265 - 1266 2000年7月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE BV

We have measured the AC magnetic susceptibility of single crystals of the heavy fermion compounds CeCu6 and CeNi at temperatures down to 250 mu K. The susceptibility of CeCu6 shows a peak at about 2 mK in a zero magnetic field. The peak height along a-axis is about 10 times as large as along b- and c-axis, and decreases to zero in increasing field up to 11 mT. It is likely that the susceptibility of CeNi along c-axis has three peaks: below 350 mu K, at 47 mK and at 0.3 K, respectively. The two peaks at lower temperatures are suppressed by a magnetic field. The newly observed peaks in the susceptibilities for CeCu6 and CeNi suggest effects of magnetic impurities rather than of magnetic ordering. (C) 2000 Elsevier Science B.V. All rights reserved.

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Heavy electron mass and the Kondo effect in PrSn3

A. Yamaguchi, S. Araki, K. Miyake, K. Sugiyama, R. Settai, Y. Onuki, Z. Kletowski

Physica B: Condensed Matter 281-282 126 - 127 2000年6月

記述言語：英語出版者・発行元：Elsevier Science Publishers B.V.

A single-crystal ingot of PrSn3 was grown by the Czochralski pulling method in an induction furnace under helium gas atmosphere of 3.6 kg/cm2. The negative magnetoresistance and the mass enhancement of the conduction electron of PrSn3 were determined by measuring the electrical resistivity, magnetoresistance and the de Haas-van Alphen effect. The Kondo effect was confirmed from a negative magnetoresistance and the presence of heavy electrons with the cyclotron effective mass m*c = 7.43-9.3 m0.

DOI： 10.1016/S0921-4526(99)00813-3

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De Haas-van Alphen effect in CeNi under pressure

S. Araki, R. Settai, Y. Inada, Y. Önuki

Physica B: Condensed Matter 281-282 ( 281&282 ) 736 - 737 2000年6月

記述言語：英語出版者・発行元：Elsevier Science Publishers B.V.

An intermediate valence compound CeNi exhibits a phase transition under pressure, which is associated with the γ-α transition in Ce. To clarify a change of the electronic state under pressure, we measured the de Haas-van Alphen (dHvA) effect under pressure up to 6 kbar using a Cu-Be pressure cell. The dHvA branches are still observed after the phase transition. The topology of the Fermi surface is therefore unchanged. The cyclotron effective mass is, however, reduced from 11 to 3.2 m0 for branch ε and from 5.4 to 1.2 m0 for branch σ when the pressure is changed from 1 bar to 3.7 kbar.

DOI： 10.1016/S0921-4526(99)00844-3

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Orbital polarization effect on electronic structure and Fermi surface in ferromagnetic UGa2

H Yamagami, T Honma, E Yamamoto, Y Haga, S Araki, D Aoki, Y Inada, R Settai, Y Onuki

PHYSICA B 281 771 - 772 2000年6月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE BV

A self-consistent band calculation including an orbital polarization is performed for ferromagnetic UGa2 on the basis of an all-electron fully-relativistic spin-polarized LAPW (RSPLAPW) method with exchange-correlation potentials in a local density approximation (LDA). The obtained magnetic moment is composed of the spin of about - 2.0 mu(B) and the orbital moment of about 4.9 mu(B). Accordingly, it can be interpreted as if the configuration were a localized 5f(2), though the f character contains about 2.5 as valence electrons. From the band structure, the Fermi surface is constructed in order to analyze frequencies observed by the de Haas-van Alphen (dHvA) effect. (C) 2000 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/S0921-4526(99)01217-X

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Heavy electron mass and the Kondo effect in PrSn3

A Yamaguchi, S Araki, K Miyake, K Sugiyama, R Settai, Y Onuki, Z Kletowski

PHYSICA B 281 126 - 127 2000年6月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE BV

We measured the electrical resistivity, magnetoresistance and de Haas-van Alphen effect in PrSn3. The Kondo effect was confirmed from a negative magnetoresistance and the presence of heavy electrons with the cyclotron effective mass m(c)* = 7.33-9.3 m(0). (C) 2000 Elsevier Science B.V. All rights reserved.

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Magnetic, elastic, transport and fermi surface properties of a ferromagnetic compound UGa2

T Honma, E Yamamoto, Y Haga, R Settai, S Araki, Y Inada, T Takeuchi, K Kuwahara, H Amitsuka, T Sakakibara, H Sugawara, H Sato, A Nakamura, Y Onuki

PHYSICA B 281 195 - 196 2000年6月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE BV

In order to investigate the 5f electronic properties in a ferromagnet UGa2 with the hexagonal structure, we have performed the magnetic, elastic, transport and de Haas-van Alphen experiments. From these properties, the crystal distortion is found to occur below 100 K in the basal plane, which is most likely driven by the development of a ferromagnetic moment oriented along the [1 1 (2) over bar 0] direction. (C) 2000 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/S0921-4526(99)01114-X

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Magnetic order in the heavy fermion compound CeCu6 at mK temperatures

H Tsujii, E Tanaka, Y Ode, T Katoh, T Mamiya, S Araki, R Settai, Y Onuki

PHYSICAL REVIEW LETTERS 84 ( 23 ) 5407 - 5410 2000年6月

記述言語：英語出版者・発行元：AMERICAN PHYSICAL SOC

We have measured the ac magnetic susceptibility in various fields and thermal expansion of single crystals of the heavy fermion compound CeCu6 at temperatures down to 250 mu K. The susceptibility of CeCu6 shows a peak at about 2 mK and has a large anisotropy. We also detected an anomaly of thermal expansion at the same temperature. The observed behaviors of the susceptibility and the thermal expansion in CeCu6 indicate the occurrence of an antiferromagnetic order.

DOI： 10.1103/PhysRevLett.84.5407

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Cylindrical Fermi surfaces in rare-earth and actinide compounds

R Settai, D Aoki, P Wisniewski, Y Yoshida, A Mukai, A Yamaguchi, Y Onuki, S Yoshii, M Kasaya, K Takegahara, H Harima

PHYSICA B 281 ( 281&282 ) 758 - 760 2000年6月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE BV

We have studied the Fermi surface properties in strongly anisotropic or quasi-two-dimensional systems of CePtX (X = As, P) and UX2 (X = Sb, As). Not only the band folding but also the strong hybrdization effect play an important role in the quasi-two-dimensionality for these compounds. (C) 2000 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/S0921-4526(99)00812-1

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Cylindrical Fermi surfaces of UAs2 and UP2

P Wisniewski, D Aoki, K Miyake, N Watanabe, Y Inada, R Settai, Y Haga, E Yamamoto, Y Onuki

PHYSICA B 281 ( 281&282 ) 769 - 770 2000年6月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE BV

We grew single crystals of tetragonal UAs2 and UP2 using chemical transport method. The residual resistivity ratio of 580 and 2900, respectively, indicated high quality of samples. Shubnikov-de Haas effect measurements performed on whisker single crystals of both compounds revealed seven fundamental oscillations in UAs2 and two in UP2. Five oscillations in UAs2 correspond to the cylindrical Fermi surfaces. The cyclotron masses in UAs2 were determined to range from 0.33m(0) to 4.5m(0). The two-dimensional Fermi surfaces are due to the strongly flattened magnetic Brillouin zone, the sequence of conducting U planes separated by weakly conducting As planes and, possibly, the anisotropic hybridization of 5f electrons. (C) 2000 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/S0921-4526(99)00918-7

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