Dynamics of high rank multipoles in strongly correlated electron systems with high symmetry

• Project/Area Number: 21684018
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics II
• Research Institution: Ibaraki University
• Principal Investigator: KUWAHARA Keitaro 茨城大学, 理工学研究科, 准教授 (90315747)
• Project Period (FY): 2009 – 2012
• Project Status: Completed (Fiscal Year 2012)
• Budget Amount: ¥23,660,000 (Direct Cost: ¥18,200,000、Indirect Cost: ¥5,460,000); Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2011: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2010: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2009: ¥18,850,000 (Direct Cost: ¥14,500,000、Indirect Cost: ¥4,350,000)
• Keywords: 多極子 / 希土類へキサボライド / 充填スクッテルダイト / アクチナイド / 希土類ヘキサボライド / 中性子散乱 / X線回折 / 多極子秩序 / セリウムヘキサボライド

Research Abstract

The purpose of this research is to clarify the physical properties related to multipoles of f electrons in strongly correlated electron systems with high symmetry mainly by neutron scattering experiments. I have tried to do inelastic neutron scattering experiments at very low temperatures on (Ce,La)B^6 which is a typical system showing multipole order. However they have not been successful so far unfortunately because of technical troubles of cooling the sample, but, I could get the preliminary data about the dynamical properties of 4f electrons in the paramagnetic phase of this system. In the typical strongly correlated 5f electron system U(Ru,Rh)^2Si^2 which is considered to be related to multipoles of 5f electrons, on the other hand, the magnetic structure of the mysterious field-induced phase was determined by high-field neutron diffraction.

Research Products

• [Journal Article] Magnetic Structure of Phase II in U(Ru_<0.96>Rh_<0.04>)_2Si_2 Determined by Neutron Diffraction under Pulsed High Magnetic Fields (2013)
  • Author(s): K. Kuwahara, S. Yoshii, H. Nojiri, D. Aoki, W. Knafo, F. Duc, X. Fabreges, G. W. Scheerer, P. Frings,G. L. J. A. Rikken, F. Bourdarot, L. P. Regnault, and J. Flouquet
  • Journal Title: Physical Review Letters Volume: 110 Issue: 21 Pages: 216406-216406
  • DOI: 10.1103/physrevlett.110.216406
  • Peer Reviewed
• [Journal Article] Renormalized Motion of Dysprosium Atoms Filling Boron Cages of DyB_6 (2012)
  • Author(s): K. Iwasa, M. Udagawa, S. Tsutsui, and A. Q. R. Baron、他8名
  • Journal Title: J. Phys. Soc. Jpn Volume: 81 Issue: 11 Pages: 113601-113601
  • DOI: 10.1143/jpsj.81.113601
  • Peer Reviewed
• [Journal Article] Magnetic Excitation in Totally Symmetric Staggered Ordered Phase of PrFe4P12 (2012)
  • Author(s): K. Iwasa
  • Journal Title: J. Phys. Soc. Jpn. Volume: 81 Issue: 9 Pages: 094711-094711
  • DOI: 10.1143/jpsj.81.094711
  • Peer Reviewed
• [Journal Article] Neutron scattering study on magnetic ordering in a partially rare-earth filled skutlerudite PrxFe4Sb12 (2012)
  • Author(s): K. Iwasa
  • Journal Title: J. Phys. Conf. Ser. Volume: 391 Pages: 012025-012025
  • DOI: 10.1088/1742-6596/391/1/012025
  • Peer Reviewed
• [Journal Article] Motion of the guest ion as precursor to the first-order phase transition in the cage system GdB_6 (2011)
  • Author(s): K.Iwasa
  • Journal Title: Phys.Rev.B Volume: 84 Issue: 21
  • DOI: 10.1103/physrevb.84.214308
  • Peer Reviewed
• [Journal Article] Softening of the Longitudinal Phonon Mode along the [100] Direction in GdB6 (2011)
  • Author(s): K.Iwasa, R.Igarashi, K.Saito, C.Laulhe, T.Orihara, S.Kunii, K.Kuwahara, H.Nakao, Y.Murakami, F.Iga, M.Sera, S.Tsutsui, H.Uchiyama, A.Q.R.Baron
  • Journal Title: Chinese Journal of Physics Volume: 49 Pages: 231-238
  • Peer Reviewed
• [Journal Article] Response of Itinerant-Electron Weak Ferromagnet LaFe_4As_<12> to Pressure and Magnetic Field (2010)
  • Author(s): S. Tatsuoka, M. Watanabe, B. Suemitsu, Y. Ogawa, A. Yamada, K. Matsubayashi, Y. Uwatoko, R. Higashinaka, Y. Aoki, T. Namiki, K. Kuwahara, and H. Sato
  • Journal Title: Journal of the Physical Society of Japan Volume: 79 Issue: 6 Pages: 063704-063704
  • DOI: 10.1143/jpsj.79.063704
  • Peer Reviewed
• [Journal Article] Crystal field excitations in PrFe_4Sb_<12> synthesized under high pressure (2010)
  • Author(s): K. Kuwahara, K. Tanaka, T. Saito, S. Tatsuoka, K. Iwasa, M. Watanabe, Y. Aoki, H. Sato, M. Kohgi, K. Iwasa, H. Sugawara, C. Stock and D.T. Adroja
  • Journal Title: Journal of Physics: Conference Series Volume: 200 Issue: 1 Pages: 012101-012101
  • DOI: 10.1088/1742-6596/200/1/012101
  • Peer Reviewed
• [Journal Article] Pressure-Induced Antiferromagnetic Order in Filled Skutterudite PrFe_4P_<12> Studied by Single-Crystal High-Pressure Neutron Diffraction (2010)
  • Author(s): T. Osakabe, K. Kuwahara, D. Kawana, K. Iwasa, D. Kikuchi, Y.Aoki, M. Kohgi, and H. Sato
  • Journal Title: Journal of the Physical Society of Japan Volume: 79 Issue: 3 Pages: 034711-034711
  • DOI: 10.1143/jpsj.79.034711
  • Peer Reviewed
• [Journal Article] Response of Itinerant-Electron Weak Ferromagnet LaFe4As12 to Pressure and Magnetic Field (2010)
  • Author(s): S.Tatsuoka, M.Watanabe, B.Suemitsu, Y.Ogawa, A.Yamada, K.Matsubayashi, Y.Uwatoko, R.Higashinaka, Y.Aoki, T.Namiki, K.Kuwahara, H.Sato
  • Journal Title: Journal of the Physical Society of Japan Volume: 79
  • NAID: 210000108352
  • Peer Reviewed
• [Journal Article] Pressure-Induced Antiferromagnetic Order in Filled Skutterudite PrFe4P12 Studied by Single-Crystal High-Pressure Neutron Diffraction (2010)
  • Author(s): T.Osakabe, K.Kuwahara, D.Kawana, K.Iwasa, D.Kikuchi, Y.Aoki, M.Kohgi, H.Sato
  • Journal Title: Journal of the Physical Society of Japan 79
  • NAID: 40017011747
  • Peer Reviewed
• [Journal Article] Crystal Field Effect on Superconducting Transition in Pr<I><SUB>x</SUB></I>Os<SUB>4</SUB>Sb<SUB>12</SUB> (2009)
  • Author(s): K. Tanaka, T. Namiki, A. Imamura, M. Ueda, T. Saito, S. Tatsuoka, R. Miyazaki, K. Kuwahara, Y. Aoki, and H. Sato
  • Journal Title: Journal of the Physical Society of Japan Volume: 78 Issue: 6 Pages: 063701-063701
  • DOI: 10.1143/jpsj.78.063701
  • NAID: 130005437413
  • ISSN: 0031-9015, 1347-4073
  • Peer Reviewed
• [Journal Article] Magnetic octupole order in Ce_<0.7>La_<0.3>B_6: A polarized neutron diffraction study (2009)
  • Author(s): K. Kuwahara, K. Iwasa, M. Kohgi, N. Aso, M. Sera, F. Iga, M. Matsuura, and K. Hirota
  • Journal Title: Physica B Volume: 404 Issue: 17 Pages: 2527-2528
  • DOI: 10.1016/j.physb.2009.06.016
  • Peer Reviewed
• [Journal Article] Excitation spectrum of PrOs_4Sb_<12> under a magnetic field (2009)
  • Author(s): S. Raymond, K. Kuwahara, K. Kaneko, K. Iwasa, M. Kohgi, A.Hiess, J. Flouquet, N. Metoki, H. Sugawara, Y. Aoki and H. Sato
  • Journal Title: Journal of Physics: Condensed Matter Volume: 21 Issue: 21 Pages: 215702-215702
  • DOI: 10.1088/0953-8984/21/21/215702
  • Peer Reviewed
• [Journal Article] Excitation spectrum of PrOs4Sb12 under a magnetic field (2009)
  • Author(s): S.Raymond, K.Kuwahara, K.Kaneko, K.Iwasa, M.Kohgi, A.Hiess, J.Flouquet, N.Metoki, H.Sugawara, Y.Aoki, H.Sato
  • Journal Title: Journal of Physics : Condensed Matter 21
  • Peer Reviewed
• [Journal Article] Crystal Field Effect on Superconducting Transition in PrxOs45b12 (2009)
  • Author(s): K.Tanaka, T.Namiki, A.Imamura, M.Ueda, T.Saito, S.Tatsuoka, R.Miyazaki, K.Kuwahara, Y.Aoki, H.Sato
  • Journal Title: Journal of the Physical Society of Japan 78
  • Peer Reviewed
• [Journal Article] Magnetic octupole order in Ce0.7La0.3B6 : A polarized neutron diffraction study (2009)
  • Author(s): K.Kuwahara, K.Iwasa, M.Kohgi, N.Aso, M.Sera, F.Iga, M.Matsuura, K.Hirota
  • Journal Title: Physica B 404 Pages: 2527-2528
  • Peer Reviewed
• [Journal Article] Crystal field excitations in PrFe4Sb12 synthesized under high pressure (2009)
  • Author(s): K Kuwahara, K Tanaka, T Saito, S Tatsuoka, K Iwasa, M Watanabe, Y Aoki, H Sato, M Kohgi, K Iwasa, H Sugawara, C Stock, D T Adroja
  • Journal Title: Journal of Physics : Conference Series 200
  • Peer Reviewed
• [Journal Article] Magnetic-field dependence of antiferromagnetic structure in CeRh1-xCoxIn5 (2009)
  • Author(s): M Yokoyama, Y Ikeda, I Kawasaki, D Nishikawa, K Tenya, K Kuwahara, H Amitsuka
  • Journal Title: Journal of Physics : Conference Series 200
  • Peer Reviewed
• [Journal Article] Transport properties in filled skutterudite GdRu4P12 (2009)
  • Author(s): M Watanabe, K Tanaka, S Tatsuoka, T Saito, R Miyazaki, K Takeda, T Namiki, K Kuwahara, R Higashinaka Y Aoki, H Sato
  • Journal Title: Journal of Physics : Conference Series 78
  • Peer Reviewed
• [Presentation] 強磁場中性子回折によるU(Ru_<0.96>Rh_<0.04>)_2Si_2のII相の磁気構造の決定 (2013)
  • Author(s): 桑原慶太郎,吉居俊輔,野尻浩之,青木大,W. Knafo,F. Duc,X. Fabreges,P. Frings,G. A. Rikken,F. Bourdarot,L. P. Regnault,J. Flouquet
  • Organizer: 日本物理学会「第68回年次大会」
  • Place of Presentation: 広島大学
• [Presentation] 希土類カゴ状12ホウ化物RB_<12>(R=Sm、Yb)の熱物性と極限環境下物性 (2013)
  • Author(s): 伊賀文俊,桑原慶太郎,阿部はるか,林健人,石井克弥, 他18名
  • Organizer: 日本物理学会「第68回年次大会」
  • Place of Presentation: 広島大学
• [Presentation] 強磁場中性子回折によるU(Ru0.96Rh0.04)2Si2のII相の磁気構造の決定 (2013)
  • Author(s): 桑原慶太郎
  • Organizer: 日本物理学会 第68回年次大会
  • Place of Presentation: 広島大学
• [Presentation] 希土類カゴ状12ホウ化物RB12 (R＝Sm、Yb)の熱物性と極限環境下物性 (2013)
  • Author(s): 伊賀文俊
  • Organizer: 日本物理学会 第68回年次大会
  • Place of Presentation: 広島大学
• [Presentation] PrFe4P12の全対称型秩序相における磁気励起 (2012)
  • Author(s): 岩佐和晃, Lijie Hao, 神木正史,桑原慶太郎. J.-M.Mignot, 菅原仁, 青木勇二, 松田達磨, 佐藤英行
  • Organizer: 日本物理学会
  • Place of Presentation: 関西学院大
  • Year and Date: 2012-03-24
• [Presentation] 充填スクッテルダイト化合物SmFe_4P_<12>の多重項励起 (2012)
  • Author(s): 鈴木明日香、今野智之、内海吉浩、阿部はるか、桑原慶太郎、川名大地、横尾哲也、伊藤晋一
  • Organizer: 日本中性子科学会第12回年会
  • Place of Presentation: 京都大学
• [Presentation] 茨城県材料構造解析装置(iMATERIA)による粉末中性子磁気構造解析 (2012)
  • Author(s): 阿部はるか、鈴木明日香、貝木隆仁、桑原慶太郎、星川晃範、石垣徹
  • Organizer: 日本中性子科学会第12回年会
  • Place of Presentation: 京都大学
• [Presentation] 茨城県材料構造解析装置 (iMATERIA)による粉末中性子磁気構造解析 (2012)
  • Author(s): 阿部はるか
  • Organizer: 日本中性子科学会 第１２回年会
  • Place of Presentation: 京都大学
• [Presentation] 充填スクッテルダイト化合物SmFe4P12の多重項励起 (2012)
  • Author(s): 鈴木明日香
  • Organizer: 日本中性子科学会 第１２回年会
  • Place of Presentation: 京都大学
• [Presentation] 高対称強相関f電子系における秩序とダイナミクス (2011)
  • Author(s): 桑原慶太郎
  • 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
• [Presentation] CexLa1-xB6(x=1.0, 0.7)の短波長中性子回折 (2010)
  • Author(s): 桑原慶太郎
  • Organizer: 日本物理学会
  • Place of Presentation: 岡山大
  • Year and Date: 2010-03-21
• [Presentation] 合成法の異なるPrxFe_4Sb_<12>の磁性に関する中性子散乱実験による研究 (2010)
  • Author(s): 折原敏彦,岩佐和晃,村上洋一,菅原仁,桑原慶太郎,田中謙弥,齊藤隆志,龍岡翔,岩佐圭祐,渡辺慎,青木勇二,佐藤英行,神木正史
  • Organizer: 日本物理学会2010年秋季大会
  • Place of Presentation: 大阪府立大学
• [Presentation] 充填スクッテルダイト化合物PrFe_4P_<12>の10GPa級超高圧力下中性子回折 (2010)
  • Author(s): 長壁豊隆,山内宏樹,桑原慶太郎
  • Organizer: 日本物理学会2010年秋季大会
  • Place of Presentation: 大阪府立大学
• [Presentation] 高分解能チョッパー分光器の建設 (2010)
  • Author(s): 伊藤晋一,横尾哲也,佐藤卓,矢野真一郎,佐藤節夫,鈴木純一,上野健治,桑原慶太郎,岩佐和晃,加美山隆,山室修,大山研司, 他12名
  • Organizer: 日本物理学会「第65会年次大会」
  • Place of Presentation: 岡山大学
• [Presentation] Ce_xLa_<1-x>B6(x = 1.0, 0.7)の短波長中性子回折 (2010)
  • Author(s): 桑原慶太郎,岩佐和晃,神木正史,J. Robert,J.-M. Mignot,世良正文,伊賀文俊
  • Organizer: 日本物理学会「第65会年次大会」
  • Place of Presentation: 岡山大学
• [Presentation] 強相関f電子系における高次多極子秩序 (2009)
  • Author(s): 桑原慶太郎
  • Organizer: 茨城県中性子利用促進研究会
  • Place of Presentation: いばらき量子ビーム研究センター
  • Year and Date: 2009-09-18