Rattling phenomena in the beta-pyrochlore oxides and related compounds

• Project/Area Number: 22340092
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: The University of Tokyo
• Principal Investigator: HIROI Zenji 東京大学, 物性研究所, 教授 (30192719)
• Co-Investigator(Kenkyū-buntansha): OKAMOTO Yoshihiko 東京大学, 物性研究所, 助教 (90435636) ; YAMAURA Junichi 東京大学, 物性研究所, 助教 (80292762)
• Project Period (FY): 2010-04-01 – 2014-03-31
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥18,980,000 (Direct Cost: ¥14,600,000、Indirect Cost: ¥4,380,000); Fiscal Year 2013: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2012: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2011: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2010: ¥7,150,000 (Direct Cost: ¥5,500,000、Indirect Cost: ¥1,650,000)
• Keywords: ラットリング / 超伝導 / カゴ状化合物 / 電子格子相互作用 / 籠状化合物 / βパイロクロア酸化物 / 新物質探索 / 物性実験 / パイロクロア酸化物

Research Abstract

Rattling is the local vibration of a relatively small atom/ion encapsulated in an atomic cage in a crystal and strongly interacts with surrounding electrons on the cage owing to the unusually large amplitude of the vibration associated with the anharmonicity. This electron-rattling interaction causes a strong-coupling superconductivity and a large mass enhancement of conduction electrons. We have focused on a typical cage compound beta-pyrochlore oxides and studied the rattling phenomena through crystal growth, structural analyses and physical property measurements. We have successfully obtained experimental evidence to show the essential feature of the rattling.

Research Products

• [Journal Article] Pressure Effects on Rattling and Superconductivity in the Einstein Solids (2013)
  • Author(s): Y. Ikeda, Y. Kawasaki, T. Shinohara, S. Araki, T. C. Kobayashi, A. Onosaka, Y. Okamoto, J. Yamaura, Z. Hiroi
  • Journal Title: J. Phys. Soc. Jpn. Volume: 82 Issue: 6 Pages: 63707-63707
  • DOI: 10.7566/jpsj.82.063707
  • NAID: 210000132577
  • Peer Reviewed
• [Journal Article] Understanding of the Temperature-Pressure Phase Diagram of beta-Pyrochlore Oxides: A Role of Anhamonicity on Superconductivity (2013)
  • Author(s): T. Isono, D. Iguchi, T. Matsubara, Y. Machida, B. Salce, J. Flouquet, H. Ogusu, J. Yamaura, Z. Hiroi, K. Izawa
  • Journal Title: J. Phys. Soc. Jpn. Volume: 82 Issue: 11 Pages: 114708-114708
  • DOI: 10.7566/jpsj.82.114708
  • Peer Reviewed
• [Journal Article] Rattling and Superconducting Properties of the Cage Compound Ga_xV_2Al_20 (2012)
  • Author(s): Z. Hiroi, A. Onosaka, Y. Okamoto, J. Yamaura, H. Harima
  • Journal Title: J. Phys. Soc. Jpn Volume: 81 Issue: 12 Pages: 124707-124707
  • DOI: 10.1143/jpsj.81.124707
  • Peer Reviewed
• [Journal Article] Large and homogeneous mass enhancement in the rattling-induced superconductor Kos_2O_6, T. Terashima (2012)
  • Author(s): N. Kurita, A. Kiswandhi, E.-S. Choi, J. S. Brooks, K. Sato, J. Yamaura, Z. Hiroi, H. Harima, S. Uji
  • Journal Title: Phys. Rev. B Volume: 85
  • Peer Reviewed
• [Journal Article] Rattling Good Superconductor : the ss-Pyrochlore Oxide AOs_2O_6 (2012)
  • Author(s): Z.Hiroi
  • Journal Title: Journal of the Physical Society of Japan Volume: 81 Issue: 1 Pages: 011012-011012
  • DOI: 10.1143/jpsj.81.011012
  • Peer Reviewed
• [Journal Article] Large and homogeneous mass enhancement in the rattling-induced superconductor KOs2O6 (2012)
  • Author(s): T. Terashima, N. Kurita, A. Kiswandhi, E.-S. Choi, J. S. Brooks, K. Sato, J. Yamaura, Z. Hiroi, H. Harima, S. Uji
  • Journal Title: Phys. Rev. B Volume: 85 Issue: 18 Pages: 180503-180503
  • DOI: 10.1103/physrevb.85.180503
  • Peer Reviewed
• [Journal Article] Rattling Vibrations Observed by Means of Single-Crystal X-ray Diffraction in the Filled Skutterudite Ros_4Sb_12 (R = La, Ce, Pr, Nd, Sm) (2011)
  • Author(s): J. Yamaura, Z. Hiroi
  • Journal Title: J. Phys. Soc. Jpn Volume: 81 Issue: 5 Pages: 054601-054601
  • DOI: 10.1143/jpsj.80.054601
  • Peer Reviewed
• [Journal Article] Superconductivity and Rattling under High Pressure in the ss-Pyrochlore Oxide RbOs_2O_6 (2011)
  • Author(s): N.Takeshita
  • Journal Title: Journal of the Physical Society of Japan Volume: 80 Issue: 10 Pages: 104708-104708
  • DOI: 10.1143/jpsj.80.104708
  • Peer Reviewed
• [Journal Article] Superconducting and Structural Transitions in the β-Pyrochlore Oxide Kos_2O_6 under High Pressure (2010)
  • Author(s): H. Ogusu, N. Takeshita, K. Izawa, J. Yamaura, Y. Ohishi, S. Tsutsui, Y. Okamoto, Z. Hiroi
  • Journal Title: J. Phys. Soc. Jpn Volume: 79 Issue: 11 Pages: 114710-114710
  • DOI: 10.1143/jpsj.79.114710
  • Peer Reviewed
• [Journal Article] Isomorphic structural transition in the β-pyrochlore oxide superconductor Kos_2O_6 (2010)
  • Author(s): J. Yamaura, M. Takigawa, O. Yamamuro, Z. Hiroi
  • Journal Title: J. Phys. Soc. Jpn Volume: 79 Issue: 4 Pages: 043601-043601
  • DOI: 10.1143/jpsj.79.043601
  • Peer Reviewed
• [Journal Article] J.Phys.Soc.Jpn. (2010)
  • Author(s): H.Ogusu, N.Takeshita, K.Izawa, J.Yamaura, Y.Ohishi, S.Tsutsui, Y.Okamoto, Z.Hiroi
  • Journal Title: Superconducting and Structural Transitions in the β-Pyrochlore Oxide K 0s_2O_6 under High Pressure Volume: 79
  • Peer Reviewed
• [Journal Article] Isomorphic structural transition in the B-pyrochlore oxide superconductor K0s_2O_6 (2010)
  • Author(s): J.Yamaura, M.Takigawa, 0.Yamamuro, Z.Hiroi
  • Journal Title: J.Phys.Soc.Jpn. Volume: 79
  • Peer Reviewed
• [Presentation] AV2Al20 (A = Y, La)におけるディラック電子の可能性 (2014)
  • Author(s): 廣瀬峻啓，岡本佳比古，播磨尚朝，廣井善二
  • Organizer: 日本物理学会第69回年次大会
  • Place of Presentation: 東海大学（神奈川県）
• [Presentation] AV2Al20 (A = Y, La)における巨大反磁性の起源 (2013)
  • Author(s): 廣瀬峻啓，岡本佳比古，山浦淳一，廣井善二，播磨尚朝
  • Organizer: 日本物理学会2013年秋季大会
  • Place of Presentation: 徳島大学（徳島県）
• [Presentation] β-パイロクロアにおけるアルカリ元素の非調和振動 (2012)
  • Author(s): 筒井智嗣, 山浦淳一, Alfred Q. R. Baron, 広井善二
  • Organizer: 日本物理学会第37回年会
  • Place of Presentation: 関西学院大学
  • Year and Date: 2012-03-26
• [Presentation] イオン交換法を用いたパイロクロア酸化物の合成と物性 (2012)
  • Author(s): 佐藤耕太, 山浦淳一, 岡本佳比古, 古府麻衣子, 山室修, 広井善二
  • Organizer: 日本物理学会第37回年会
  • Place of Presentation: 関西学院大学
  • Year and Date: 2012-03-25
• [Presentation] Rattling and superconductivity in cage compounds (2012)
  • Author(s): Zenji Hiroi
  • Organizer: International Symposium on Physics and Chemistry of Novel Superconductors and Related Materials
  • Place of Presentation: 岡山大学
  • Invited
• [Presentation] ラットリングと超伝導 (2012)
  • Author(s): 廣井善二
  • Organizer: 日本物理学会秋季大会
  • Place of Presentation: 横浜国立大学
  • Invited
• [Presentation] SUPERCONDUCTIVITY IN AN EINSTEIN SOLID : A_xV_2Al_20 (A = Ga, Al) (2012)
  • Author(s): Zenji Hiroi
  • Organizer: 19th International Conference on Magnetism
  • Place of Presentation: 釜山,韓国
• [Presentation] SUPERCONDUCTIVITY IN AN EINSTEIN SOLID: AxV2Al20 (A = Ga, Al) (2012)
  • Author(s): Z. Hiroi
  • Organizer: 19th International Conference on Magnetism
  • Place of Presentation: 釜山、韓国
• [Presentation] Rattling-induced superconductivity in the beta-pyrochlore oxides (2010)
  • Author(s): Zenji Hiroi
  • Organizer: Physics of New Materials
  • Place of Presentation: Zurich, Switzerland
  • Year and Date: 2010-08-23
• [Presentation] Rattling-induced superconductivity in the beta-pyrochlor oxides (2010)
  • Author(s): Zenji Hiroi
  • Organizer: Physics of New Materials
  • Place of Presentation: Zurich, Switzerland
  • Year and Date: 2010-08-23
• [Presentation] A Liquid-Gas Transition in a Solid (2010)
  • Author(s): Zenji Hiroi
  • Organizer: the 21st IUPAC International Conference on Chemical Thermodynamics
  • Place of Presentation: つくば国際会議場
  • Year and Date: 2010-08-01
• [Presentation] A Liquid-Gas Transition in a Solid (2010)
  • Author(s): Zenji Hiroi
  • Organizer: the 21st IUPAC International Conference on Chemical Thermodynamics
  • Place of Presentation: つくば国際会議場(エポカルつくば)
  • Year and Date: 2010-08-01
• [Remarks]
  • URL: http://hiroi.issp.u-tokyo.ac.jp/saito/Hiroi_Lab.html
• [Remarks] 「がらがら」と鳴る超伝導
  • URL: http://hiroi.issp.u-tokyo.ac.jp/saito/Research/entori/2012/1/30_garagarato_mingru_chao_chuan_dao_yi_ban.html
• [Remarks]
  • URL: http://hiroi.issp.u-tokyo.ac.jp/saito/Hiroi_Lab.html