アクチノイド系低次元層状化合物の物性研究

2007 Fiscal Year Annual Research Report

• Project/Area Number: 17350032
• Research Institution: Japan Atomic Energy Agency
• Principal Investigator: 中村 彰夫 Japan Atomic Energy Agency, 先端基礎研究センター, 研究主幹 (80370443)
• Co-Investigator(Kenkyū-buntansha): 塩川 佳伸 東北大学, 金属材料研究所, 教授 (50111307) ; 本間 佳哉 東北大学, 金属材料研究所, 助教 (00260448) ; 山本 悦嗣 日本原子力研究開発機構, 先端基礎研究センター, 研究副主幹 (50343934) ; 中田 正美 日本原子力研究開発機構, 原子力基礎基盤研究部門, 研究副主幹 (60370441) ; 酒井 宏典 日本原子力研究開発機構, 先端基礎研究センター, 研究職 (80370401)
• Keywords: アクチノイド / 低次元化合物 / 物質創製 / 磁性 / 超伝導 / 構造

Research Abstract

Li挿入により超伝導になる遷移金属窒化塩化物MNCI(M=Ti,Zr,Hf)や類似の低次元層状構造化合物研究のアクチノイド(An=Th,U,Np等)(5f電子)系への展開を目指し、An系窒化ハロゲン化物AnNX並びに関連低次元化合物(カルコゲナイド、プニクタイト、錯体等)の物質創製とこれらの発現する新規な電子状態、電子物性の探索研究に取り組んだ。空気中で不安定なAnNX系を取り扱う酸素、水分フリーの不活性ガス(アルゴン)雰囲気循環生成装置を備えたグローブボックスを作成した。これを用いTh,U系試料調製を試みた。U系では塩化カドミウム(CdCl_2)法によりUNCI試料調製に成功しこれがT_c=32Kの強磁性体であること、またLi挿入でより高い転移温度の弱強磁性体に変化していくことを見出した。目下そのX線構造データとの対応付けに努めている。しかし、Li挿入により超伝導化の期待されるThNC1は現在まで同法では調製できていない。塩化アンモニウム法等を含めThNC1を調製し、そのLi挿入による超電導化の可否を早急に明らかにしたい。類似層状化合物(カルコゲナイド、錯体)等も、並行して研究を進めた。また、当グループで発見した類似の層状構造Np系金属間化合物NpPd_5Al_2超電導体の研究も進めた。更に、Np系研究の有力な武器である^<237>Npメスバウアー分光測定の開発・整備も同時に進めた。

Research Products

• [Journal Article] Pressure effect on paramagnet β-US_2 (2008)
  • Author(s): S. Ikeda, H. Sakai, T.D. Matsuda, N. Tateiwa, A. Nakamura, E. Yamamoto, D. Aoki, Y. Homma, Y. Shiokawa, M. Hedo, Y. Uwatoko, Y. Haga, Y. Onuki
  • Journal Title: Physica B:Condensed Matter 403 Pages: 893-894
  • Peer Reviewed
• [Journal Article] Molecular magnetism of neptunyl(+1,+2)complexes:237Np-Moessbauer and Magnetic Study (2007)
  • Author(s): A. Nakamura, M. Nakada, T. Nakamoto, T. Kitazawa and M. Takeda
  • Journal Title: J.Alloys and Compounds 444-445 Pages: 621-633
  • Peer Reviewed
• [Journal Article] Defect-fluorite oxides M_1-yLn_yO_2-y/2(Ln=lanthanide;M=HF,Zr,Ce,U,Th):Structure,property and applications (2007)
  • Author(s): A. Nakatnura, N. Masaki, H. Otobe, Y., Hinatsu, J. Wang, M. Takeda
  • Journal Title: Pure and Applied Chemistry 79 Pages: 1691-1729
  • Peer Reviewed
• [Journal Article] Neutron diffraction and X-ray absorption study of Ag_5Pb_2O_6 (2007)
  • Author(s): K. Yoshii, M. Mizumaki, K. Kato, T. Uruga, H. Abe, A. Nakamura, Y. Shimojo, Y. Ishii, Y. Morii
  • Journal Title: J.Solid State Chemistry 180 Pages: 377-381
  • Peer Reviewed
• [Journal Article] Itinerant 5f electrons and the Fermi surface properties in neptunium compounds (2007)
  • Author(s): D. Aoki, H. Yamagami, Y. Homma, H. Sakai, S. Ikeda, Y. Shiokawa, E. Yamamoto, A. Nakamura, Y. Haga, R. Settai, Y. Onuki
  • Journal Title: J.Magnetism and Magnetic Materials 310 Pages: 1678-1783
  • Peer Reviewed
• [Journal Article] NMR observation of quadrupolar order parameter in NpO_2 (2007)
  • Author(s): Y. Tokunaga, D. Aoki, Y. Homma, S. Kambe, H. Sakai, S. Ikeda, T. Fujimoto, R.E. Walstedt, H. Yasuoka, Y. Shiokawa, E. Yamamoto, A. Nakamura
  • Journal Title: J.Magnetism and Magnetic Materials 310 Pages: 1678-1783
  • Peer Reviewed
• [Journal Article] Magnetism,superconductivity and Fermi surfaces of Pu compounds (2007)
  • Author(s): Y. Tokunaga, D. Aoki, H. Yamagami, T. D.. Matsuda, K. Nakajima, Y. Arai, Y.. Homma, Y. Shiokawa E. Yamamoto, A. Nakamura, Y. Onuki
  • Journal Title: J.Magnetism and Magnetic Materials 310 Pages: e149-e151
  • Peer Reviewed
• [Journal Article] Enhancement of relaxation rates in the normal state of superconductor PuRhGa_5;NQR relaxation study (2007)
  • Author(s): H. Sakai, S. Kambe, Y. Tokunaga, T. Fujunoto, R.E. Walstedt, H. Yasuoka, D. Aoki, Y. Homma, E. Yamamoto, A. Nakamura, Y. Shiokawa, K. Nakajima, Y. Arai, T.D. Matsuda, Y. Haga, Y. Onuki
  • Journal Title: J.Magnetism and Magnetic Materials 310 Pages: e118-e119
  • Peer Reviewed
• [Journal Article] High-field magnetization in transuranium compound (2007)
  • Author(s): S. Sugiyama, H. Nakashima, D. Aoki, S. Ikeda, Y. Haga, E. Yamamoto, A. Nakamura, Y. Homma, Y. Shiokawa, K. Kindo, M. Hagiwara, Y. Onuki
  • Journal Title: J.Magnetism and Magnetic Materials 310 Pages: 178901791
  • Peer Reviewed
• [Journal Article] 57Fe Moessbauer spectroscopy of NpFeGa_5 in magnetic field (2007)
  • Author(s): Y. Hotnma, S. Nasu, A. Nakamura, D. Aoki, Y. Haga, N. Metoki, H. Sakai, S. Ikeda, Y. Shiokawa, Y. Onuki
  • Journal Title: J.Magnetism and Magnetic Materials 310 Pages: 440-442
  • Peer Reviewed
• [Journal Article] Magnetic properties and Fermi surfaces in NpIn_3 (2007)
  • Author(s): D. Aoki, H. Yamagami, Y. Homma, H. Sakai, S. Ikeda, Y. Shiokawa, E. Yamamoto, ANakamura, Y. Haga, R. Settai, Y. Onuki
  • Journal Title: J.Magnetism and Magnetic Materials 310 Pages: 385-388
  • Peer Reviewed
• [Journal Article] Unconventional heavy-fermion superconductivity of a newtransuranium compound NpPd_5Al_2 (2007)
  • Author(s): D. Aoki, Y. Haga T.D. Matsuda, N. Tateiwa, S. Ikeda, Y. Homma, H. sakai, Y. Shiokawa, E. Yamamoto, A. Nakamura. R. Settai, Y. Onuki
  • Journal Title: J.Phys.Soc.Jpn 76 Pages: 063701(1-4)
  • Peer Reviewed
• [Journal Article] Anisotropic spin fluctuations and anomalies of nuclear quadyupole interactions in the itinerant antiferromagnetic NpCoGa_5:59Co NMR and 69,71Ca NMR/NQR studies (2007)
  • Author(s): H. Sakai, S. Kambe, Y. Tokunaga, T. Fujimori, R.E. Walstedt, H. Yasuoka, D. Aoki, Y. Homma, E. Yamamoto, A. Nakamura, Y. Shiokawa, Y. Onuki
  • Journal Title: Phys.Rev B76 Pages: 024410(1-14)
  • Peer Reviewed
• [Journal Article] Electrical and Magnetic Properties of an Ising-Type Ferromagnet NpSb_2 (2007)
  • Author(s): Y. Homma, D. Aoki, Y. Haga, H. Sakai, S. Ikeda, E. Yamamoto, A. Nakamura, Y. Shiokawa, Y. Onuki
  • Journal Title: J.Phys.Soc.Jpn. 76 Pages: 074715
  • Peer Reviewed
• [Journal Article] Single Crystal Growth,Superconductivity and Fermi Surface Study of Plutonium Compounds (2007)
  • Author(s): Y. Haga, D. Aoki, H. Yamagami, T.D. Matsuda, K. Nakajima, Y. Arai, E. Yamamoto, A. Nakamura, Y. Homma, Y. Shiokawa, Y. Onuki
  • Journal Title: J. Alloys and Compounds 444-445 Pages: 114-118
  • Peer Reviewed
• [Journal Article] NMR,Studies of Actinide Dioxides (2007)
  • Author(s): Y. Tokunaga, H. Sakai, T. Fujunoto, S. Kambe, R.E. Walstedt, K. Ikushima, H. Yasuoka, D. Aoki, Y. Houuna, Y. Haga, T.D. Matsuda, S. Ikeda, E. Yamamoto, A. Nakamura, Y. Shiokawa K. Nakajima, Y. Arai, Y. Onuki
  • Journal Title: J.Alloys and Colnpounds 444-445 Pages: 241-245
  • Peer Reviewed
• [Journal Article] Magnetic and Dielectric Properties of Tb_<0.5>Cab_<0.5>MnO_3 (2007)
  • Author(s): Y. Hiramitsu, K. Yoslui, Y. Yoneda, J. Mizuki, A. Nakamura, Y. Shimojo, Y. Ishii, Y. Morii, N. Ikeda
  • Journal Title: J.J.Appl.Phys 46 Pages: 7171-7174
  • Peer Reviewed
• [Journal Article] 17O NMR spin-lattice relaxatioll in Np02:Field-dependellt cross-relaxation process driven by 237Np spins (2007)
  • Author(s): Y. Tokunaga, R.E. Walstedt, Y. Homma D. Aoki, S. Kambe, H. Sakai, T. Fujunoto, S.Ikeda, E. Yamamoto, A. Nakamura. Y. Shiokawa, H. Yasuoka
  • Journal Title: J.Phys.Chem.Solids 68 Pages: 2016-2019
  • Peer Reviewed
• [Journal Article] Magnetic Compton scattering study of NpNiGa_5 (2007)
  • Author(s): S. Tsutsui, Y. Sakurai, M. Itou, D. Aoki, E. Yamamoto, Y. Homma, Y. Haga, A. Nakamura, Y. Shiokawa, Y. Onuki
  • Journal Title: J.Phys.Chem.Solids 68 Pages: 2099-2102
  • Peer Reviewed
• [Journal Article] Ga NQR relaxation rates in sup erconductor PuRhGa_5 (2007)
  • Author(s): H. Sakai, S. Kambe, Y. Tokunaga, T. Fujimoto, R.E.Walstedt, H. Yasuoka, D. Aoki, Y. Homma, E.Yamamoto., A. Nakamura, Y. Shiolcawa, K. Nakajima, Y. Arai, T.D. Matsuda, Y. Haga, Y. Onuki
  • Journal Title: J.Phys.Chem.Solids 68 Pages: 2103-2106
  • Peer Reviewed
• [Presentation] ウランカルコゲナイド化合物UXX'(X,X':S,Se,Te)の磁性と伝導 (2008)
  • Author(s): 池田 修悟, 酒井 宏典, 中村 彰夫, 塩川 佳伸, 芳賀 芳範, 大貫 惇睦, 他
  • Organizer: 日本物理学会第63回年次大会
  • Place of Presentation: 近畿大学(大阪)
  • Year and Date: 20080323-26
• [Presentation] 新規超伝導体NpPd_5Al_2の27Al NMRによる研究2 (2008)
  • Author(s): 中堂 博之, 酒井 宏典, 徳永 陽, 神戸 振作, 青木 大, 本間 佳哉, 塩川 佳伸, 芳賀 芳範, 松田 達磨, 池田 修悟, 立岩 尚之, 山本 悦嗣, 中村 彰夫, 大貫 惇陸
  • Organizer: 日本物理学会第63回年次大会
  • Place of Presentation: 近畿大学(大阪)
  • Year and Date: 20080323-26
• [Presentation] NpPd_3単結晶の低温物性 (2008)
  • Author(s): 本間 佳哉, 芳賀 芳範, 青木 大, 酒井 宏典, 松田 達磨, 池田 修悟, 山本 悦嗣, 中村 彰夫, 塩川 佳伸, 大貫 惇睦
  • Organizer: 日本物理学会第63回年次大会
  • Place of Presentation: 近畿大学(大阪)
  • Year and Date: 20080323-26
• [Presentation] Pressure effect on paramagnet β-US_2 and ferromagnet UTeS (2007)
  • Author(s): S. Ikeda, H. Sakai, T.D. Matsuda, N. Tateiwa, D. Aolti, Y. Homma, E. Yamamoto, A. Nakamura, Y. Shiokawa, T. Yamada, Y. Ohta, K. Sugiyama, K. Matsubayashi, M. Hedo, Y. Uwatoko, M. Hedo, Y. Haga, Y. Onuki
  • Organizer: The Int'1 Conf on Strongly Correlated Electron Systems 2007
  • Place of Presentation: Houston(米国)
  • Year and Date: 20070830-31
• [Presentation] アクチノイド、ランタノイド欠陥蛍石型酸化物のEu-151及びGd-155メスバウアー分光 (2007)
  • Author(s): 中村 彰夫
  • Organizer: 第2回核共鳴散乱研究会
  • Place of Presentation: Spring-8(兵庫)
  • Year and Date: 20070823-26