Hidden multipolar orderings explored by nuclear specific heat measurements

2010 Fiscal Year Final Research Report

• Project/Area Number: 20540359
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Tokyo Metropolitan University
• Principal Investigator: AOKI Yuji Tokyo Metropolitan University, 理工学研究科, 准教授 (20231772)
• Project Period (FY): 2008 – 2010
• Keywords: 強相関系 / スクッテルダイト / 核比熱 / 超微細相互作用 / 超微細結合多重項 / 多極子

Research Abstract

An experimental method has been established to determine easily and accurately whether the order parameter includes the f-electron multipoles in low temperature ordered states in rare-earth compounds by nuclear specific heat measurements. Using this method, various ordered phases in rare earth compounds including filled skutterudites have been explored. In PrRu_4P_<12>, we have found a quite rare state where "4f-electron-nuclear hyperfine-coupled multiplets" (formed by the hyperfine interaction between the 4f electron magnetic moment and the nuclear spin in a Pr ion) forming a lattice in the crystal lattice. This is the first thermodynamical observation of its kind.

Research Products

• [Journal Article] f-Electron-Nuclear Hyperfine-Coupled Multiplets in the Unconventional Charge Order Phase of Filled Skutterudite PrRu_4P_12 (2011)
  • Author(s): Yuji Aoki, Takahiro Namiki, Shanta R. Saha, Takashi Tayama, Toshiro Sakakibara, Ryousuke Shiina, Hiroyuki Shiba, Hitoshi Sugawara, Hideyuki Sato
  • Journal Title: J.Phys.Soc.Jpn. 80,5月号
  • Peer Reviewed
• [Journal Article] Temperature-dependent development of the magnetic-field-insensitive heavy fermion state in SmOs4Sb12 (2011)
  • Author(s): Yuji Aoki, Shotaro Sanada, Daisuke Kikuchi, Hitoshi Sugawara, Hideyuki Sato
  • Journal Title: J.Phys.Soc.Jpn. 80(Supplement掲載予定)
  • Peer Reviewed
• [Journal Article] Single crystal growth and low temperature properties of PrNb_2Al_20 (2011)
  • Author(s): R. Higashinaka, A. Nakama, M. Ando, M. Watanabe, Y. Aoki, H. Sato
  • Journal Title: J.Phys.Soc.Jpn. 80(Supplement掲載予定)
  • Peer Reviewed
• [Journal Article] Suppression of time reversal symmetry breaking superconductivity in Pr(Os,Ru)_4Sb_12 and (Pr,La)Os_4Sb_12 (2011)
  • Author(s): Lei Shu, W. Higemoto, Y. Aoki, A.D. Hillier, K. Ohishi, K. Ishida, R. Kadono, A. Koda, O.O. Bernal, D.E. MacLaughlin, Y. Tunashima, Y. Yonezawa, S. Sanada, D. Kikuchi, H. Sato, H. Sugawara, T.U. Ito, M.B. Maple
  • Journal Title: Phys.Rev. B83,100504(R) Pages: 4
  • Peer Reviewed
• [Journal Article] Pr deficiency effect on the heavy fermion superconductor Pr_xO_s4Sb_12 (2010)
  • Author(s): Y. Aoki, A. Imamura, R. Miyazaki, T. Saito, R. Higashinaka, I. Umegaki, T. Fukuhara, H. Sato
  • Journal Title: PhysicaC 470 Pages: S545-S547
  • Peer Reviewed
• [Journal Article] Comment on "Pronounced Enhancement of the Lower Critical Field and Critical Current Deep in the Superconducting State of PrO_s4Sb_12 (2010)
  • Author(s): D.E. MacLaughlin, A.D. Hillier, J.M. Mackie, Lei Shu, Y. Aoki, D. Kikuchi, H. Sato, Y. Tunashima, H. Sugawara
  • Journal Title: Phys.Rev.Lett. 105,019701 Pages: 1
  • Peer Reviewed
• [Journal Article] Crossing of the crystalline-electric-field and rattling-phonon excitation energies in the filled skutterudite superconductor Pr(Os1-xRux)_4Sb_12 (2010)
  • Author(s): Ryoichi Miyazaki, Yuji Aoki, Daisuke Kikuchi, Hitoshi Sugawara, Hideyuki Sato
  • Journal Title: Journal of Physics : Conference Series 200 Pages: 012125(5)
  • Peer Reviewed
• [Journal Article] Observation of Magnetic Monopoles in Spin Ice (2009)
  • Author(s): Hiroaki Kadowaki, Naohiro Doi, Yuji Aoki, Yoshikazu Tabata, Taku J. Sato, Jeffrey W. Lynn, Kazuyuki Matsuhira, Zenji Hiroi
  • Journal Title: J.Phys.Soc.Jpn. 78 Pages: 103706(4)
  • Peer Reviewed
• [Journal Article] Anomalous properties in the low-carrier ordered phase of PrRu_4P_12 : Consequence of hybridization between conduction and Pr 4f electrons (2009)
  • Author(s): S.R. Saha, H. Sugawara, T. Namiki, Y. Aoki, H. Sato
  • Journal Title: :Phys.Rev. B80 Pages: 014433(6)
  • Peer Reviewed
• [Journal Article] Crystal field effect on superconducting transition in P_rxO_s4Sb_12 (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: J.Phys.Soc.Jpn. 78,No.6 Pages: 063701(4)
  • Peer Reviewed
• [Journal Article] Possible low-energy excitations of multipoles in SmRu_4P_12 probed by muon spin relaxation (2009)
  • Author(s): Takashi U. Ito, Wataru Higemoto, Kazuki Ohishi, Robert H. Heffner, Nobuhiko Nishida, Kazuhiko Satoh, Hitoshi Sugawara, Yuji Aoki, Daisuke Kikuchi, Hideyuki Sato
  • Journal Title: PhysicaB 404 Pages: 761-764
  • Peer Reviewed
• [Journal Article] Weak ferromagnetic ordering in the anomalous field-insensitive heavy-fermion state in S_mO_s4Sb_12 (2009)
  • Author(s): Y. Aoki, W. Higemoto, Y. Tsunashima, Y. Yonezawa, K.H. Satoh, A. Koda, T.U. Ito, K. Ohishi, R.H. Heffner, D. Kikuchi, H. Sato
  • Journal Title: PhysicaB 404 Pages: 757-760
  • Peer Reviewed
• [Journal Article] Anomalous Electronic Behaviors in Ferromagnetic Kondo Lattice S_mFe_4P_12 (2008)
  • Author(s): Daisuke Kikuchi, Hitoshi Sugawara, Kenya Tanaka, Hidekazu Aoki, Miki Kobayashi, Shotaro Sanada, Keitaro Kuwahara, Yuji Aoki, Hiroaki Shishido, Rikio Settai, Yoshichika Onuki, Hisatomo Harima, Hideyuki Sato
  • Journal Title: J.Phys.Soc.Jpn. 77,No.11 Pages: 114705(7)
  • Peer Reviewed
• [Journal Article] Novel Features Realized in the Filled Skutterudite Structure (2008)
  • Author(s): Hideyuki Sato, Daisuke Kikuchi, Kenya Tanaka, Makoto Ueda, Hidekazu Aoki, Tsuyoshi Ikeno, Sho Tatsuoka, Keitaro Kuwahara, Yuji Aoki, Masafumi Kohgi, Hitoshi Sugawaral, Kazuaki Iwasa, Hisatomo Harima
  • Journal Title: J.Phys.Soc.Jpn. 77(Supplement A) Pages: 1-6
  • Peer Reviewed
• [Journal Article] The Ground State of P_rFe_4P_12 Probed by Thermal and Thermoelectric Transport (2008)
  • Author(s): A. Pourret, K. Behnia, D. Kikuchi, Y. Aoki, H. Sugawara, H. Sato
  • Journal Title: J.Phys.Soc.Jpn. 77(Supplement A) Pages: 102-107
  • Peer Reviewed
• [Journal Article] Muon Knight shift measurements in possible octupole ordering system S_mRu_4P_12 (2008)
  • Author(s): T.U. Ito, W. Higemoto, K. Ohishi, R.H. Heffner, N. Nishida, K. Satoh, H. Sugawara, Y. Aoki, D. Kikuchi, H. Sato
  • Journal Title: PhysicaB 403/5-9 Pages: 1647-1649
  • Peer Reviewed
• [Journal Article] Octupole ordering in filled-skutterudite S_mRu_4P_12 (2008)
  • Author(s): Y. Aoki, S. Sanada, D. Kikuchi, H. Sugawara, H. Sato
  • Journal Title: PhysicaB 403/5-9 Pages: 1574-1576
  • Peer Reviewed
• [Presentation] 高圧フラックス法で作製された充填スクッテルダイトCeOs_4Sb_12の低温物性 (2010)
  • Author(s): 畠山和也, 他4名
  • Organizer: 日本物理学会第65回年次大会
  • Place of Presentation: 岡山大学津島キャンパス
  • Year and Date: 20100320-20100323
• [Presentation] 高圧下で育成した単結晶における重希土類系スクッテルダイトGdRu_4P_12の低温物性 (2009)
  • Author(s): 渡辺慎, 他7名
  • Organizer: 日本物理学会2009年秋季大会
  • Place of Presentation: 熊本大学黒髪キャンパス
  • Year and Date: 20090925-20090928
• [Presentation] Small Energy Splitting of the Pr Triplet Crystalline-Electric-Field Ground State in PrRu_4P_12 (2009)
  • Author(s): 青木勇二, 他4名
  • Organizer: International Conference on Magnetism (ICM2009)
  • Place of Presentation: カールスルーヘ・ドイツ
  • Year and Date: 2009-08-28
• [Presentation] Crossing of the crystalline-electric-field and rattling phonon excitation energies in the filled skutterudite superconductor Pr(Os_1-xRu_x)_4Sb_12 (2009)
  • Author(s): 宮崎亮一, 他4名
  • Organizer: International Conference on Magnetism (ICM2009)
  • Place of Presentation: カールスルーヘ・ドイツ
  • Year and Date: 2009-08-28
• [Presentation] 充填スクッテルダイト化合物GdRu_4P_12の比熱と電子輸送特性 (2008)
  • Author(s): 渡辺慎, 他8名
  • Organizer: 日本物理学会第63回年次大会
  • Place of Presentation: 岩手大学
  • Year and Date: 20080920-20080923
• [Presentation] Itinerant multipolar ordering in the vicinity of a QCP in skutterudite CeOs_4Sb_12 (2008)
  • Author(s): 青木勇二, 他6名
  • Organizer: the International Conference on Strongly Correlated Electron Systems SCES'08
  • Place of Presentation: Brazil, Buzios
  • Year and Date: 20080817-20080822
• [Presentation] Weak ferromagnetic ordering in the anomalous field insensitive heavy-fermion state in SmOs_4Sb_2 (2008)
  • Author(s): 青木勇二, 他9名
  • Organizer: 11th International Conference on Muon Spin Rotation Relaxation and Resonance μSR2008
  • Place of Presentation: 筑波
  • Year and Date: 20080721-20080725
• [Presentation] Novel features in filled skutterudites containing rare-earth elements with a plural number of 4f-electrons (2008)
  • Author(s): H. Sato, 他15名
  • Organizer: 11th International Conference on Muon Spin Rotation Relaxation and Resonance μSR2008
  • Place of Presentation: 筑波
  • Year and Date: 20080721-20080725
• [Presentation] シンポジウム講演「Smスクッテルダイトにおける磁場に鈍感な重い電子状態」主題「ラットリングと超伝導・重い電子」
  • Author(s): 青木勇二
  • 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: 00000923-00000926
• [Presentation] 充填スクッテルダイトSm_xLa_1-xOs_4Sb_12の磁場に鈍感な重い電子状態
  • Author(s): 末光文也, 他4名
  • 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: 00000923-00000926
• [Presentation] 近藤格子反強磁性体YbNi_3Al_9の比熱および磁気熱量測定
  • Author(s): 宮崎亮一, 他4名
  • 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: 00000923-00000926
• [Presentation] Temperature-dependent development of the magnetic field insensitive heavy-fermion state in SmOs_4Sb_12
  • Author(s): 青木勇二, 他4名
  • Organizer: International conference on Heavy Electrons 2010(ICHE2010)
  • Place of Presentation: 東京
  • Year and Date: 00000917-00000920
• [Presentation] La-substitution effect on the heavy fermion state in filled skutterudite SmOs_4Sb_12
  • Author(s): 末光文也, 他4名
  • Organizer: International conference on Heavy Electrons 2010(ICHE2010)
  • Place of Presentation: 東京
  • Year and Date: 00000917-00000920
• [Presentation] 企画講演「充填スクッテルダイトにおける磁場の影響を受けない重い電子状態」
  • Author(s): 青木勇二
  • Organizer: 日本物理学会第66回年次大会(地震により中止、発表成立)
  • Place of Presentation: 新潟大
  • Year and Date: 00000325-00000328
• [Presentation] 充填スクッテルダイトPrRu_4P_12の低温非金属相におけるPr三重項基底状態
  • Author(s): 青木勇二, 他8名
  • Organizer: 日本物理学会第66回年次大会(地震により中止、発表成立)
  • Place of Presentation: 新潟大
  • Year and Date: 00000325-00000328
• [Book] Handbook of Magnetic Materials(Chap. 1 Magnetic Properties of Filled Skutterudites.)(K.H.J. Buschow, editors),Vol 18 (2009)
  • Author(s): H.Sato, H. Sugawara, Y.Aoki, H. Harima
  • Total Pages: 1-110
  • Publisher: The Netherlands : Elsevier
• [Book] 熱電変換技術ハンドブック(第2章熱電変換材料 第2節化合物半導体 3.スクッテルダイト化合物 3.5低温物性)(監修梶川武信) (2008)
  • Author(s): 青木勇二、佐藤英行
  • Total Pages: 87-96
  • Publisher: 株式会社NTS
• [Remarks] ホームページ等
  • URL: http://www.comp.tmu.ac.jp/~aoki/