中性子散乱による配列ナノ空間物質の構造解析

• Project Area: New Materials Science Using Regulated Nano Spaces －Strategy in Ubiquitous Elements
• Project/Area Number: 22013022
• Research Category: Grant-in-Aid for Scientific Research on Priority Areas
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Japan Atomic Energy Agency
• Principal Investigator: 金子 耕士 独立行政法人日本原子力研究開発機構, 量子ビーム応用研究部門, 研究副主幹 (30370381)
• Project Period (FY): 2010 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥2,300,000 (Direct Cost: ¥2,300,000); Fiscal Year 2011: ¥1,200,000 (Direct Cost: ¥1,200,000); Fiscal Year 2010: ¥1,100,000 (Direct Cost: ¥1,100,000)
• Keywords: 物性実験 / 量子ビーム / 強相関電子系 / 低温物性 / ラットリング / 配列ナノ空間物質

Research Abstract

配列ナノ空間をもつ物質において内包イオンが示す巨大振幅振動について、単結晶中性子構造解析を中心に、その詳細な描像及び物性との関連をにより明らかにすることを目指していた。しかし今年度は、震災の影響により、研究炉原子炉JRR-3及びパルス中性子源J-PARC/MLFともに停止してしまったため、国内での中性子散乱実験実施が不可能になった。そのため、海外施設を用いた中性子散乱実験及び放射光X線非弾性散乱実験へと切り替えて、研究を進めた。まず、顕著な非調和大振幅振動を示すPrOs_4Sb_<12>について、非調和振動が誘起する動的応答を探索するため、高効率中性子回折計を用いた実験を行った。その結果、温度上昇に伴い振幅が大きくなるにつれて、特定の格子点周りに散漫散乱状の散乱強度の増加を見出した。この散乱は構造因子の大きい格子点周りに観測されている事から、格子歪みとの結合が考えられ、この歪みを通じて物性に影響を及ぼしている可能性がある。この結果に基づき、非弾性X線散乱実験により、フォノンのゾーン依存性について調べた。その結果、音響フォノンとゲストモードの混成効果がゾーンにより大きく異なることを明らかにした。実験結果から、非調和性とゲスト-格子相互作用及び物性との関連を明らかにするため、定量的な解析を進めている。今回の結果から、スクッテルダイトにおける非調和振動が及ぼす影響として、ゲストモードのソフト化だけではなく、音響フォノンとの混成効果の重要性を明らかにすることが出来た。今後、調和的なPrRu4Sb12や関連化合物との比較等を進めていくことで、非調和振動の発現条件、さらには物性発現機構の解明が期待される

Research Products

• [Journal Article] Neutron Scattering Study on High-quality Single Crystals of Non-Centrosymmetric Heavy-Fermion Superconductor CePt_3Si (2012)
  • Author(s): K.Kaneko, et al
  • Journal Title: J.Phys.Soc.Jpn. Volume: (in press)
  • Peer Reviewed
• [Journal Article] Effect of magnetic field in heavy-fermion compound YbCo_2Zn_<20> (2012)
  • Author(s): K.Kaneko, et al
  • Journal Title: J.Phys. : Conf.Ser. Volume: (in press)
  • Peer Reviewed
• [Journal Article] Magnetic Excitations in the spin-5/2 Antiferromagnetic Trimer Substance SrMn_3P_4O_<14> (2011)
  • Author(s): M.Hase, M.Matsuda, K.Kaneko, et al
  • Journal Title: Phys.Rev.B Volume: 84 Issue: 21
  • DOI: 10.1103/physrevb.84.214402
  • Peer Reviewed
• [Journal Article] Spin Density Wave in Insulating Ferromagnetic Frustrated Chain LiCuVO4 (2011)
  • Author(s): T. Masuda, (5名、1番目)
  • Journal Title: J. Phys. Soc. Jpn. Volume: 80 Issue: 11 Pages: 113705-113705
  • DOI: 10.1143/jpsj.80.113705
  • NAID: 210000109253
  • Peer Reviewed
• [Journal Article] Magnons and electromagnons in a spin-lattice-coupled frustrated magnet CuFeO_2 as seen via inelastic neutron scattering (2011)
  • Author(s): T.Nakajima, A.Suno, S.Mitsuda, N.Terada, S.Kimura, K.Kaneko, et al
  • Journal Title: Phys.Rev.B Volume: 84 Issue: 18 Pages: 184401-184401
  • DOI: 10.1103/physrevb.84.184401
  • Peer Reviewed
• [Journal Article] Neutron Diffraction Study of Successive Magnetic Phase Transitions of Distorted-Triangular-Lattice Antiferromagnet RbFeBr_3 (2011)
  • Author(s): Y.Nishiwaki, A.Oosawa, K.Kakurai, K.Kaneko, et al
  • Journal Title: J.Phys.Soc.Jpn. Volume: 80 Issue: 8 Pages: 084711-084711
  • DOI: 10.1143/jpsj.80.084711
  • Peer Reviewed
• [Journal Article] Neutron Scattering Studies of the spin-5/2 Antiferromagnetic Linear Trimer Substance SrMn_3P_4O_<14> (2011)
  • Author(s): M.Hase, A.Donni, K.Ozawa, O.Sakai, V.Pomjakushin, L.Keller, K.Kaneko, et al
  • Journal Title: J.Phys. : Conf.Ser. Volume: 340 Pages: 012066-012066
  • DOI: 10.1088/1742-6596/340/1/012066
  • Peer Reviewed
• [Journal Article] Current Status of a Time-of-Flight Single Crystal Neutron Diffractometer SENJU at J-PARC (2011)
  • Author(s): I.Tamura, K.Oikawa, T.Kawasaki, T.Ohhara, K.Kaneko, et al
  • Journal Title: Phys.Rev.B Volume: 84 Pages: 120401-4
  • DOI: 10.1088/1742-6596/340/1/012040
  • Peer Reviewed
• [Journal Article] Hybridization of magnetic excitations between quasi-one-dimensional spin chain and spin dimers in Cu_3Mo_2O_9 observed using inelastic neutron scattering (2011)
  • Author(s): H.Kuroe, T.Hamasaki, T.Sekine, M.Hase, K.Oka, T.Ito, H.Eisaki, K.Kaneko, et al
  • Journal Title: Phys.Rev.B Volume: 83
  • Peer Reviewed
• [Journal Article] Magnetic Structure Determination of CeT_2Al_<10> (T=Ru and Os) : Single Crystal Neutron Diffraction Studies (2011)
  • Author(s): H.Kato, R.Kobayashi, T.Takesaka, T.Nishioka, M.Matsumura, K.Kaneko, et al
  • Journal Title: J.Phys.Soc.Jpn. Volume: 80
  • Peer Reviewed
• [Journal Article] Neutron Scattering Study on U-Dichalcogenides (2010)
  • Author(s): N.Metoki, K.Kaneko, et al
  • Journal Title: IOP Conference Series : Materials Science and Engineering Volume: 9
  • Peer Reviewed
• [Presentation] 重い電子系化合物YbCo_2Zn_<20>の中性子非弾性散乱実験及び磁場効果 (2012)
  • Author(s): 金子耕士, 他
  • Organizer: 日本物理学会第67回年次大会
  • Place of Presentation: 関西学院大学
  • Year and Date: 2012-03-27
• [Presentation] Effect of magnetic field on magnetic excitation in heavy-fermion superconductors probed via neutron scattering (2012)
  • Author(s): K.Kaneko, et al.
  • Organizer: 2^<nd> International REIMEI workshop on New approach to the exotic phases of actinide compounds under unconventional extreme conditions (REIMEI2012)
  • Place of Presentation: Grenoble, France(招待講演)
  • Year and Date: 2012-02-01
• [Presentation] 充填スクッテルダイトPrOs_4Sb_<12>における非調和振動に起因した新規応答の探索 (2012)
  • Author(s): 金子耕士
  • Organizer: 特定領域「ユビキタス元素戦略」第9回領域会議
  • Place of Presentation: 物質・材料研究機構
  • Year and Date: 2012-01-10
• [Presentation] Neutron Scattering Study on High-quality Single Crystals of Non-Centrosymmetric Heavy-Fermion Superconductor CePt_3Si (2011)
  • Author(s): K.Kaneko, et al.
  • Organizer: International workshop on heavy fermions (TOKIMEKI2011)
  • Place of Presentation: Osaka, UK(招待講演)
  • Year and Date: 2011-11-26
• [Presentation] Neutron scattering study on rattling in filled skutterudite compounds (2011)
  • Author(s): K.Kaneko, et al.
  • Organizer: International Conference of New Science Created by Materials with Nano Space
  • Place of Presentation: Sendai, Japan
  • Year and Date: 2011-11-25
• [Presentation] Novel antiferromagnetic ground state in non-centrosymmetric heavy-fermion superconductor CePt_3Si (2011)
  • Author(s): K.Kaneko, et al.
  • Organizer: 1^<st> Asia-Oceania Conference on Neutron Scattering (1st AOCNS)
  • Place of Presentation: Tsukuba, Japan(招待講演)
  • Year and Date: 2011-11-21
• [Presentation] Effect of magnetic field in heavy-fermion compound YbCo_2Zn_<20> (2011)
  • Author(s): K.Kaneko, et al.
  • Organizer: Strongly Correlated Electron Systems 2011 (SCES2011)
  • Place of Presentation: Cambridge, UK
  • Year and Date: 2011-08-30
• [Presentation] 中性子散乱による配列ナノ空間物質の構造解析 (2011)
  • Author(s): 金子耕士
  • Organizer: 特定領域「ユビキタス元素戦略」第4回若手研究会
  • Place of Presentation: 東北大学
  • Year and Date: 2011-07-15
• [Presentation] 中性子で見るTbCoGa_5の逐次相転移 (2011)
  • Author(s): 金子耕土, 他
  • Organizer: 日本物理学会第66回年次大会
  • Place of Presentation: 新潟大学
  • Year and Date: 2011-03-28
• [Presentation] 国内外の中性子実験施設における強磁場環境の現状について (2011)
  • Author(s): 金子耕土
  • Organizer: J-PARC・MLFにおける中性子強磁場実験環境、高圧実験環境についての検討会
  • Place of Presentation: いばらき量子ビーム研究センター
  • Year and Date: 2011-03-08
• [Presentation] Neutron Triple-Axis Spectrometers in the Research Reactor JRR-3 (2011)
  • Author(s): K.Kaneko, et al
  • Organizer: 6th Workshop on Speciation, Techniques, and Facilities for Radioactive Materials at Synchrotron Light Sources and Other Quantum Beam Sources (AnXAS 2011)
  • Place of Presentation: Harima, Japan
  • Year and Date: 2011-03-02
• [Presentation] 配列ナノ空間物質の中性子散乱による研究 (2011)
  • Author(s): 金子耕土, 他
  • Organizer: JRR-3改造20周年記念シンポジウム-研究用原子炉JRR-3の利用成果と今後の展開-
  • Place of Presentation: 日本科学未来舘
  • Year and Date: 2011-02-28
• [Presentation] Effect of magnetic field in non-centrosymmetric heavy-fermion superconductor CePt_3Si (2011)
  • Author(s): K.Kaneko, et al
  • Organizer: The International Workshop on Neutron Applications on Strongly Correlated Electron Systems 2011 (NASCES11)
  • Place of Presentation: Ibaraki, Japan
  • Year and Date: 2011-02-24
• [Presentation] One aspect of magnetism and superconductivity in heavy-fermions : Neutron diffraction study (2011)
  • Author(s): K.Kaneko, et al
  • Organizer: The 1st ASRC International Workshop "New Approach to the exotic phases of actinides compounds under unconventional experimental conditions"
  • Place of Presentation: Ibaraki, Japan
  • Year and Date: 2011-02-17
• [Presentation] 配列ナノ空間物質の単結晶中性子構造解析 (2011)
  • Author(s): 金子耕士
  • Organizer: 特定領域「ユビキタス元素戦略」第7回領域会議
  • Place of Presentation: 大阪大学
  • Year and Date: 2011-01-07
• [Presentation] Future perspective of studies of heavy-fermion compounds by polarised neutron (2011)
  • Author(s): K.Kaneko
  • Organizer: ICC-IMR International Workshop "Novel Material Science using Polarized Neutron"
  • Place of Presentation: Sendai, Japan
  • Year and Date: 2011-01-06
• [Presentation] 空間反転対称性の欠如したCeCoGe_3における多段磁気転移 (2010)
  • Author(s): 金子耕土, 他
  • Organizer: 日本中性子科学会第10回年会
  • Place of Presentation: 東北大学
  • Year and Date: 2010-12-10
• [Presentation] Unusual magnetic field response in non-centrosymmetric heavy-fermion superconductor CePt_3Si (2010)
  • Author(s): K.Kaneko
  • Organizer: International Workshop "Superconductivity Explored by Neutron Scattering Experiments (SENSE2010)"
  • Place of Presentation: Grenoble, France
  • Year and Date: 2010-10-23
• [Presentation] Sample environments at Japan Atomic Energy Agency (2010)
  • Author(s): K.Kaneko
  • Organizer: 6th International Workshop on Sample Environment at Neutron Scattering Facilities (SE@NSF)
  • Place of Presentation: Munchen, Germany
  • Year and Date: 2010-09-29
• [Presentation] Neutron scattering study on rattling in filled-skutterudite compounds (2010)
  • Author(s): K.Kaneko, et al
  • Organizer: The International Conference on Heavy Electrons 2010 (ICHE2010)
  • Place of Presentation: Tokyo Metropolitan Univ.
  • Year and Date: 2010-09-20
• [Presentation] 中性子散乱による配列ナノ空間物質の構造解析 (2010)
  • Author(s): 金子耕士
  • Organizer: 特定領域「ユビキタス元素戦略」第6回領域会議
  • Place of Presentation: 名古屋大学
  • Year and Date: 2010-05-30