Investigation of anomalous ground state on geometrically frustrated magnet

• Project/Area Number: 21740261
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics II
• Research Institution: Tokyo Metropolitan University
• Principal Investigator: HIGASHINAKA Ryuji Tokyo Metropolitan University, 大学院・理工学研究科, 助教 (30435672)
• Project Period (FY): 2009 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2010: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2009: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
• Keywords: 幾何学的フラストレーション / パイロクロア酸化物 / スピンアイス / カゴ状構造 / 重い電子状態 / 四極子近藤効果

Research Abstract

Pyrochlore oxide Tb_2Ti_2O_7 dose not show any long range ordering down to 20mK and the true ground state had not established yet. Recently, theorists proposed that in the ground state of this material the "quantum spin ice" state is realized. This state consists of the superposition of six classical spin ice states by the hybridization of first excited doublet. From the DC magnetization and specific heat measurements down to 100 mK in the magnetic field along [100], [110], [111] directions, we clarified the Ising-like magnetic anisotropy and the plateau-like feature is observed below 0.5K similar to the Kagome-plateau of spin ice compounds. In addition, we observed the anomaly in specific heat indicating the phase transition to quantum spin ice state.

Research Products

• [Journal Article] Current understanding of the heavy fermion superconductivity in PrOs_4Sb_<12> (2010)
  • Author(s): H.Sato, K.Tanaka, D.Kikuchi, T.Namiki, R.Higashinaka, Y.Aoki, M.Kohgi, H.Sugawara, K.Kuwahara, K.Iwasa
  • Journal Title: PhysicaC Vol.470 Pages: 525-525
  • Peer Reviewed
• [Journal Article] Response of Itinerant-Electron Weak Ferromagnet LaFe_4As_<12> to Pressure and Magnetic Field (2010)
  • Author(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: J.Phys.Soc.Jpn. vol.79 Pages: 63704-63704
  • Peer Reviewed
• [Journal Article] Response of Itinerant-Electron Weak Ferromagnet LaFe_4As_<12> to Pressure and Magnetic Field (2010)
  • Author(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: J.Phys.Soc.Jpn. Volume: 79 Pages: 63704-63704
  • Peer Reviewed
• [Journal Article] Transport Properties in Filled Skutterudite GdRu_4P_<12> (2010)
  • 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 Volume: 200 Pages: 102222-102222
  • Peer Reviewed
• [Journal Article] Current understanding of the heavy fermion superconductivity in PrOs_4Sb_<12> (2010)
  • Author(s): H.Sato, K.Tanaka, D.Kikuchi, T.Namiki, R.Higashinaka, Y.Aoki, M.Kohgi, H.Sugawara, K.Kuwahara, K.Iwasa
  • Journal Title: PhysicaC Volume: 470
  • Peer Reviewed
• [Journal Article] Pr deficiency effect on the heavy fermion superconductor Pr_xOs_4Sb_<12> (2010)
  • Author(s): Y.Aoki, A.Imamura, R.Miyazaki, T.Saito, R.Higashinaka, I.Umegaki, T.Fukuhara, H.Sato
  • Journal Title: PhysicaC Volume: 470
  • Peer Reviewed
• [Journal Article] Pr deficiency effect on the heavy-fermion superconductor Pr_xO_<S4>Sb_<12> (2010)
  • Author(s): Y.Aoki, A.Imamura, R.Miyazaki, T.Saito, R.Higashinaka, I.Umegaki, T.Fukuhara, H.Sato
  • Journal Title: Physica C (印刷中)
  • Peer Reviewed
• [Journal Article] Transport properties in filled skutterudite GdRu_4P_<12> (2010)
  • Author(s): M.Watanabe, S.Tatsuoka, T.Saito, R.Miyazaki, K.Takeda, T.Namiki, K.Kuwahara, R.Higasinaka, Y.Aoki, H.Sato
  • Journal Title: J.Phys. : Conf.Series 200 Pages: 12222-12222
  • Peer Reviewed
• [Presentation] カゴ状物質RNb_2Al_<20>の単結晶育成と低温物性測定 (2011)
  • Author(s): 東中隆二、中間章浩、宮崎亮一、青木勇二、佐藤英行
  • Organizer: 日本物理学会 第66回年次大会
  • Place of Presentation: 新潟大学 五十嵐キャンパス
• [Presentation] PrT_2Al_<20>(T=Mo,Ta,W)の単結晶育成と物性測定 (2011)
  • Author(s): 中間章浩、東中隆二、青木勇二、佐藤英行
  • Organizer: 日本物理学会 第66回年次大会
  • Place of Presentation: 新潟大学 五十嵐キャンパス
• [Presentation] カゴ状物質 RNb_2Al_<20> (R = La, Pr) の単結晶育成と低温物性測定 (2010)
  • Author(s): 東中隆二、中間章浩、安藤誠、渡辺慎、青木勇二、佐藤英行
  • Organizer: 日本物理学会秋季大会
  • Place of Presentation: 大阪府立大学 中百舌鳥キャンパス
  • Year and Date: 2010-09-23
• [Presentation] カゴ状物質RNb_2Al_<20>(R=La,Pr)の単結晶育成と低温物性測定 (2010)
  • Author(s): 東中隆二、中間章浩、安藤誠、渡辺慎、青木勇二、佐藤英行
  • Organizer: 日本物理学会 秋季大会
  • Place of Presentation: 大阪府立大学 中百舌鳥キャンパス
  • Year and Date: 2010-09-23
• [Presentation] YbT_2Al_<20>(T=Ti,V,Cr)の単結晶育成と物性測定 (2010)
  • Author(s): 中間章浩、東中隆二、安藤誠、渡辺慎、青木勇二、佐藤英行
  • Organizer: 日本物理学会 秋季大会
  • Place of Presentation: 大阪府立大学 中百舌鳥キャンパス
  • Year and Date: 2010-09-23
• [Presentation] Magnetic and transport properties of RT_2Al_<20> (R = rare earth, T = Ti, V, Cr and Nb) (2010)
  • Author(s): R.Higashinaka, A.Nakama, M.Ando M.Watanabe, Y.Aoki, H.Sato
  • Organizer: Strongly Correlated Electron Systems SCES2010
  • Place of Presentation: Santa Fe convention center, New Mexico, USA
• [Presentation] Magnetic and transport properties of RT_2Al_<20>(R=rare earth, T=Ti,V,Cr and Nb) (2010)
  • Author(s): R.Higashinaka, A.Nakama, M.Ando, M.Watanabe, Y.Aoki, H.Sato
  • Organizer: Strongly Correlated Electron Systems SCES2010
  • Place of Presentation: Santa Fe convention center, New Mexico, USA
• [Presentation] Single crystal growth and low temperature properties of RNb_2Al_<20>(R=La,Pr) (2010)
  • Author(s): R.Higashinaka, A.Nakama, M.Ando, M.Watanabe, Y.Aoki, H.Sato
  • Organizer: International Conference on Heavy Electron ICHE 2010
  • Place of Presentation: Tokyo Metropolitan University, Tokyo, Japan
• [Presentation] Single crystal growth and physical properties of YbT_2Al_<20>(T=Ti,V,Cr) and PrNb_2Al_<20> (2010)
  • Author(s): R.Higashinaka, A.Nakama, R.Miyazaki, M.Ando, M.Watanabe, Y.Aoki, H.Sato
  • Organizer: 新学術領域「重い電子系の形成と秩序化」ワークショップ:希薄f電子格子系の新しい秩序
  • Place of Presentation: 高知大学 朝倉キャンパス
• [Presentation] カゴ状物質PrNb_2Al_<20>の単結晶育成と低温物性測定 (2010)
  • Author(s): 東中隆二、中間章浩、末光文也、宮崎亮一、青木勇二、佐藤英行
  • Organizer: 第4回物性科学領域横断研究会「凝縮系科学の最前線」
  • Place of Presentation: 東京大学 武田ホール
• [Presentation] 量子スピンアイス物質Tb_2Ti_2O_7極低温磁場中比熱 (2009)
  • Author(s): 東中隆二, 宮崎亮一, 青木勇二, M.Ramazanoglu, H.A.Dabkowska, B.D.Galin, 高木英典, 佐藤英行
  • Organizer: 第3回特性科学領域横断研究会「凝縮系科学の最前線」
  • Place of Presentation: 東京大学 武田ホール
  • Year and Date: 2009-11-30
• [Presentation] 量子スピンアイス物質Tb_2Ti_2O_7の極低温磁場中比熱 (2009)
  • Author(s): 東中隆二, 宮崎亮一, 青木勇二, M.Ramazanoglu, H.A.Dabkowska, B.D.Gaulin, 高木英典, 佐藤英行
  • Organizer: 日本物理学会秋季大会
  • Place of Presentation: 熊本大学
  • Year and Date: 2009-09-26
• [Presentation] 高圧下で育成した高充填率単結晶LaFe_4Sb_<12>の電子輸送特性 (2009)
  • Author(s): 東中隆二, 渡辺慎, 上田真, 斉藤隆志, 龍岡翔, 田中謙弥, 青木勇二, 佐藤英行
  • Organizer: 日本物理学会 秋季大会
  • Place of Presentation: 熊本大学
  • Year and Date: 2009-09-25
• [Presentation] Transport properties of LaFe_4Sb_<12> single crystal with high filling factor grown under high-pressure (2009)
  • Author(s): R.Higashinaka, M.Watanabe, M.Udea, T.Saito, S.Tatsuoka, K.Tanaka, Y.Aoki, H.Sato
  • Organizer: 新学術領域「重い電子系の形成と秩序化」第2回研究会
  • Place of Presentation: 広島大学 東広島キャンパス
  • Year and Date: 2009-08-19
• [Presentation] 量子スビンアイス物質Tb_2Ti_2O_7極低温磁場中比熱 (2009)
  • Author(s): 東中隆二, 宮崎亮一, 青木勇二, M.Ramazanoglu, H.A.Dabkowska, B.D.Galin, 高木英典, 佐藤英行
  • Organizer: 日本物理学会 秋季大会
  • Place of Presentation: 熊本大学
  • Year and Date: 2009-06-26
• [Presentation] Investigation of quantum spin ice state in Tb_2Ti_2O_7 (2009)
  • Author(s): R.Higashinaka, R.Miyazaki, T.Tayama, M.Ramazanoglu, H.A.Dabkowska, Y.Aoki, T.Sakakibara, B.D.Gaulin, H.Takagi, H.Sato
  • Organizer: Joint European Japanese Conference : Frustration in Condensed Matter
  • Place of Presentation: Ecole Normale Superieure de Lyon, France
• [Presentation] Investigation of quantum spin ice state in Tb_2Ti_2O_7 (2009)
  • Author(s): R.Higashinaka, R.Miyazaki, T.Tayama, M.Ramazanoglu, H.A.Dabkowska, Y.Aoki, T.Sakakibara, B.D.Gaulin, H.Takagi, H.Sato
  • Organizer: Joint European Japanese Conference : Frustration in Condesed Matter
  • Place of Presentation: Ecole Normale Superieurede Lyon
• [Remarks] ホームページ等
  • URL: http://denshi-server.phys.se.tmu.ac.jp/