Study of frustrated rare-earth intermetallic compounds

2010 Fiscal Year Final Research Report

• Project/Area Number: 20540344
• 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: Saitama University
• Principal Investigator: KOSAKA Masashi Saitama University, 大学院・理工学研究科, 准教授 (20302507)
• Co-Investigator(Renkei-kenkyūsha): OHOYAMA Kenji 東北大学, 金属材料研究所, 准教授 (60241569) ; MITO Takeshi 兵庫県立大学, 物質理学研究科, 准教授 (70335420) ; MATSUMURA Takeshi 広島大学, 先端物質科学研究科, 准教授 (00312546) ; SUZUKI Hiroyuki 独立行政法人物質・材料研究機構, 主任研究員 (60354370) ; METOKI Naoto 特殊法人日本原子力研究所, 先端基礎研究センター, 主任研究員 (40343909) ; YOSHIZAWA Masahito 岩手大学, 大学院・工学研究科, 教授 (30220619) ; NAKANISHI Yoshiki 岩手大学, 大学院・工学研究科, 准教授 (70322964)
• Project Period (FY): 2008 – 2010
• Keywords: 強相関系

Research Abstract

We found that the intermetallic compound YbAl_3C_3 exhibits an spin-singlet ground state at low temperatures. The structure of the first excited triplet state, which develops rapidly below 10K, is directly clarified by inelastic neutron scattering experiments with a higher energy resolution. The spin-singlet ground state has never been observed in 4f electron systems. The two-dimensional frustrated triangular lattice and the low carrier density play an important role in the realization of the spin-singlet ground state. In order to investigate physical properties of YbAl_3C_3, we have performed synchrotron X-ray diffraction, NMR・NQR, specific heat, magnetization, electrical resistivity and elastic constant measurements.

Research Products

• [Journal Article] ^<27>Al NMR/NQR Studies of YbAl_3C_3 (2009)
  • Author(s): T.Mito, S.Tomisawa, S.Wada, H.Harima, K.Hashi, T.Shimizu, A.Goto, S.Ohki, Y.Kato, M.Kosaka
  • Journal Title: J.Phys.Soc.Jpn. 78 Pages: 014709
  • Peer Reviewed
• [Journal Article] Spin-Singlet Ground State in the Two-Dimensional Frustrated Triangular Lattice : YbAl_3C_3 (2008)
  • Author(s): Y.Kato, M.Kosaka, H.Nowatari, Y.Saiga, A.Yamada, T.Kobiyama, S.Katano, K.Ohoyama, H.S.Suzuki, N.Aso, K.Iwasa
  • Journal Title: J.Phys.Soc.Jpn. 77 Pages: 053701
  • URL: http://sucra.saitama-u.ac.jp/modules/xoonips/detail.php?id=A1002708
  • Peer Reviewed
• [Journal Article] Structural Phase Transition in the Spin Gap System YbAl_3C_3 (2008)
  • Author(s): T.Matsumura, T.Inami, M.Kosaka, Y.Kato, T.Inukai, A.Ochiai, H.Nakao, Y.Murakami, S.Katano, H.S.Suzuki
  • Journal Title: J.Phys.Soc.Jpn. 77 Pages: 103601
  • Peer Reviewed
• [Presentation] YbAl_3C_3のパルス磁場中超音波測定 (2010)
  • Author(s): 七宮史崇,吉澤正人,三田村裕幸,中西良樹,小坂昌史,榊原俊郎,金道浩一
  • Organizer: 日本物理学会
  • Place of Presentation: 大阪府立大学
  • Year and Date: 2010-09-23
• [Presentation] Inelastic neutron scattering study of spin gap formation in YbAl_3C_3 (2010)
  • Author(s): D.T.Adroja, K.A.McEwen, M.Kosaka, 他
  • Organizer: International Conference on Strongly Correlated Electron Systems
  • Place of Presentation: Santa Fe, NM, USA
  • Year and Date: 2010-06-29
• [Presentation] Yb_3F_4S_2の単結晶育成と物性 (2009)
  • Author(s): 小坂昌史,小檜山卓也,近藤健司,岩田広太郎,片野進,香取浩子,白川直樹
  • Organizer: 日本物理学会
  • Place of Presentation: 熊本大学
  • Year and Date: 2009-09-28
• [Presentation] RNiP(R=Ce,Nd)の磁性 (2009)
  • Author(s): 近藤健司,小坂昌史,片野進,香取浩子
  • Organizer: 日本物理学会
  • Place of Presentation: 熊本大学
  • Year and Date: 2009-09-25
• [Presentation] YbAl_3C_3の相転移点近傍における磁場中弾性特性 (2009)
  • Author(s): 中西良樹,七宮史崇,上山徹,出戸和久,柏崎礼子,吉澤正人,小檜山卓也,小坂昌史,片野進
  • Organizer: 日本物理学会
  • Place of Presentation: 熊本大学
  • Year and Date: 2009-09-25
• [Presentation] YbAl_3C_3の低温相結晶構造とスピンギャップ形成 (2008)
  • Author(s): 松村武,稲見俊哉,加藤慶顕,小坂昌史,狗飼敬希,落合明,中尾裕則,村上洋一,片野進,鈴木博之
  • Organizer: 日本物理学会
  • Place of Presentation: 岩手大学
  • Year and Date: 2008-09-20
• [Remarks] ホームページ等
  • URL: http://www.phy.saitama-u.ac.jp/hp/