Investigation of anomalous ground state on geometrically frustrated magnet

2010 Fiscal Year Final Research Report

• 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
• Keywords: 幾何学的フラストレーション

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
  • 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: 063704
  • Peer Reviewed
• [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
  • Year and Date: 20100627-20100702
• [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] 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
  • Year and Date: 20090513-20090514
• [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
• [Remarks] ホームページ等
  • URL: http://denshi-server.phys.se.tmu.ac.jp/