Study of thermo-electrical transport properties on oxide compounds of filled skutterudite similar structure

• Project/Area Number: 19740214
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics II
• Research Institution: University of the Ryukyus
• Principal Investigator: HEDO Masato University of the Ryukyus, 理学部, 准教授 (00345232)
• Project Period (FY): 2007 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥3,530,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥330,000); Fiscal Year 2008: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2007: ¥2,100,000 (Direct Cost: ¥2,100,000)
• Keywords: スクッテルダイト構造 / 酸化物 / 熱電材料 / 新奇物性探索 / 熱電能 / 高圧力

Research Abstract

ネオジウム系充填スクッテルダイト様酸化物は原料の反応性がよく、求める結晶構造ができていることを確認した。他にサマリウム系、イットリビウム系も同様である。しかし、未反応の原料と思われる不純物が確認され、単相試料が得られていない。セリウム系は何度も合成を試みたが、出発原料から反応が進まず、試料は得られなかった。微少試料での圧力下熱電能測定システムの開発に成功した。それによって、圧力誘起価数転移物質の相転移に伴う大きな電子状態の変化を観測することに成功した。

Research Products

• [Journal Article] Pressure-induced Kondo semiconductor : The filled skutterudite compound CeRu4Sb12 (2009)
  • Author(s): N. Kurita, M. Hedo, M. Koeda, M. Kobayashi, H. Sato, H. Sugawara, Y. Uwatoko
  • Journal Title: Physical Review B 79 Pages: 14441-14441
  • Peer Reviewed
• [Journal Article] Pressure-induced Kondo semiconductor : The filled skutterudite compound CeRu_4Sb_<12> (2009)
  • Author(s): N. Kurita, et.al.
  • Journal Title: Physical Review B 79 Pages: 14441-14441
  • Peer Reviewed
• [Journal Article] Pressure-induced Magnetic Transition in a Single Crystal of YbCo2Zn20 (2008)
  • Author(s): Y. Saiga, K. Matsubayashi, T. Fujiwara, M. Kosaka, S. Katano, M. Hedo, T. Matsumoto, Y. Uwatoko
  • Journal Title: Journal of Physical Society of Japan 77 Pages: 53710-53710
  • NAID: 130005436464
  • Peer Reviewed
• [Journal Article] Heat capacity of CeIrSi3 under high pressure (2008)
  • Author(s): F. Tomioka, M. Hedo, I. Umehara, Y. Uwatoko, Y. Takano, Y. Okuda
  • Journal Title: Journal of Physics and Chemistry of Solids 69 Pages: 3199-3201
  • Peer Reviewed
• [Journal Article] Anomalously Wide Superconducting Phase of One-Dimensional Organic Conductor (TMTTTF) 2SbF6 (2008)
  • Author(s): M. Itoi, C. Araki, M. Hedo, Y. Uwatoko, T. Nakamura
  • Journal Title: Journal of Physical Society of Japan 77 Pages: 23701-23701
  • Peer Reviewed
• [Journal Article] Magnetic properties of Ca3Ru2O7 under uniaxial pressures (2008)
  • Author(s): Y. Yoshida, S. Ikeda, N. Shirakawa, M. Hedo, Y. Uwatoko
  • Journal Title: Journal of Physical Society of Japan 77 Pages: 93702-93702
  • NAID: 130005437000
  • Peer Reviewed
• [Journal Article] Heat capacity of CeIrSi_3 under high pressure (2008)
  • Author(s): F. Tomioka, et.al.
  • Journal Title: Journal of Physics and Chemistry of Solids 69 Pages: 3199-3201
  • Peer Reviewed
• [Journal Article] Magnetic properties of Ca_3Ru_2O_7 under uniaxial pressures (2008)
  • Author(s): Y. Yoshida, et.al.
  • Journal Title: Journal of Physical Society of Japan 77 Pages: 93702-93702
  • Peer Reviewed
• [Journal Article] Physical properties of a new cuprate superconductor Pr2Ba4Cu7O15-δ (2007)
  • Author(s): A. Matsushita, K. Fukuda, Y. Yamada, F. Ishikawa, S. Sekiya, M. Hedo and T. Naka
  • Journal Title: Science and Technology of Advanced Materials 8 Pages: 477-483
  • Peer Reviewed
• [Journal Article] Physical properties of a new cuprate superconductor Pr_2Ba_4Cu_7O_<15-δ> (2007)
  • Author(s): A. Matsushita. K. Fukuda, Y. Yamada, F. Ishi kawa, S. Sekiya, M. Hedo and T. Naka
  • Journal Title: Spience and Technology of Advanced Materials 8 Pages: 477-483
  • Peer Reviewed
• [Presentation] Effect of pressure on thermopower and electrical resistivity of YbMn_2Ge_2 (2009)
  • Author(s): M. HEDO, et.al.
  • Organizer: 25th International conference on Low Temper ature Physics (LT25)
  • Place of Presentation: Amsterdam, Netherlands
  • Year and Date: 2009-08-08
• [Presentation] Pr0.5Sr0.5MnO3の高圧下磁化測定 (2008)
  • Author(s): 能政北斗,梅原出,CAO Shi-Xun,辺土正人,上床美也
  • Organizer: 日本物理学会
  • Place of Presentation: 岩手大学
  • Year and Date: 2008-09-20
• [Presentation] YbCo2Zn20における高圧下物性測定 (2008)
  • Author(s): 松林和幸,才賀裕太,藤原哲也,辺土正人,梅原出,松本武彦,上床美也
  • Organizer: 日本物理学会
  • Place of Presentation: 岩手大学
  • Year and Date: 2008-09-20
• [Presentation] Effect of pressure on thermopower and electrical resistivity of YbMn2Ge2 (2008)
  • Author(s): T. Nakama, M. Hedo, D. Nakamura, Y. Takaesu, K. Yagasaki, T. Fujiwara, and Y. Uwatoko
  • Organizer: 25th International conference on Low Temperature Physics (LT25)
  • Place of Presentation: Amsterdam, Netherlands
  • Year and Date: 2008-08-08
• [Presentation] EuCo2P2の圧力中熱電能 (2008)
  • Author(s): 仲村大,高江洲義尚,辺土正人,仲間隆男,矢ヶ崎克馬,藤原哲也
  • Organizer: 日本物理学会
  • Place of Presentation: 近畿大学
  • Year and Date: 2008-03-23
• [Presentation] LaRhSi2の低温比熱 (2008)
  • Author(s): 辺土正人,松林和幸,梅原出,木村憲彰,上床美也
  • Organizer: 日本物理学会
  • Place of Presentation: 近畿大学
  • Year and Date: 2008-03-23
• [Presentation] EuCo_2P_2の圧力中熱電能 (2008)
  • Author(s): 仲村大, ら
  • Organizer: 日本物理学会
  • Place of Presentation: 近畿大学
  • Year and Date: 2008-03-23