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

2012 Fiscal Year Final Research Report

• 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
• 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

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 Pages: 216406-1-5
  • DOI: 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, K. Kuwahara, Y. Utsumi, K. Saito, H. Kobayashi, T. Sato, M. Amano, T. Hasegawa, N. Ogita, M. Udagawa, S. Tsytsui, and A. Q. R. Baron
  • Journal Title: Journal of the Physical Society of Japan Volume: 81 Pages: 113601-1-4
  • DOI: DOI:10.1143/JPSJ.81.113601
  • Peer Reviewed
• [Journal Article] Magnetic Excitation in Totally Symmetric Staggered Ordered Phase of PrFe_4P_<12> (2012)
  • Author(s): K. Iwasa L. Hao, M. Kohgi, K. Kuwahara, J-M. Mignot, H. Sugawara, Y. Aoki, T. D. Mstsuda, and H. Sato
  • Journal Title: Journal of the Physical Society of Japan Volume: 81 Pages: 094711-1-9
  • DOI: DOI:10.1143/JPSJ.81.094711
  • 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, 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: Physical Review B Volume: 84 Pages: 214308-1-6
  • DOI: DOI:10.1103/PhysRevB.84.214308
  • 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 Pages: 063704-1-4
  • DOI: 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 Pages: 012101 (4)
  • DOI: DOI:10.1088/1742-6596/200/1/012101
  • Peer Reviewed
• [Journal Article] Crystal Field Effect on Superconducting Transition in PrxOs_4Sb_<12> (2010)
  • 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 Pages: 063701-1-4
  • DOI: DOI:10.1143/JPSJ.78.063701
  • 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 Pages: 034711-1-7
  • DOI: DOI:10.1143/JPSJ.79.034711
  • 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 Pages: 2527-2528
  • DOI: 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 Pages: 215702 (5)
  • DOI: DOI:10.1088/0953-8984/21/21/215702
  • 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
  • Year and Date: 20130326-29
• [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
  • Year and Date: 20130326-29
• [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
  • Year and Date: 20121210-11
• [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
  • Year and Date: 20121210-11
• [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
  • Year and Date: 20110308-09
• [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
  • Year and Date: 20100923-26
• [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
  • Year and Date: 20100923-26
• [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
  • Year and Date: 20100320-23
• [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
  • Year and Date: 20100320-23
• [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