Research for quantum phase transition in quasicrystals

• Project/Area Number: 24654102
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics II
• Research Institution: Nagoya University
• Principal Investigator: SATO Noriaki 名古屋大学, 理学(系)研究科(研究院), 教授 (30170773)
• Co-Investigator(Kenkyū-buntansha): ISHIMASA Tsutomu 北海道大学, 大学院工学研究科, 教授 (10135270)
• Project Period (FY): 2012-04-01 – 2014-03-31
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2012: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: 準結晶 / 量子相転移 / 量子臨界現象 / 量子臨界 / 物性実験

Research Abstract

There are three types of solids on this planet: crystals that are ubiquitous around us, amorphous materials like a glass, and quasicrystals. The last type of solids was discovered at 1984 by Schechtman, a Nobel Laureate in Chemistry, 2011. The quasicrystals have unique geometrical structure such as rotational symmetry that is forbidden to crystals, therefore unique electronic states are expected to emerge in them. Besides of extensive efforts, however, the electronic structure called "critical state" that is believed to exist in the quasicrystals is not established yet. In this research project, we studied low-temperature magnetic and thermal properties of the magnetic Au-Al-Yb quasicrystal, and found that it shows unconventional quantum criticality toward zero temperature. From this observation, we suggested that this is just the critical state unique to the quasicrystal. Our results may open a road to a novel research field near the border of the crystal and the quasicrystal.

Research Products

• [Journal Article] Valence Charge Driven by Constituent Element Substitution in the Mixed-Valence Quasicrystal and Approximant Au-Al-Yb (2014)
  • Author(s): Shuya Matsukawa, Katsumasa Tanaka, Mika Nakayama, Kazuhiko Deguchi, Keiichiro Imura, Hiroyuki Takakura, Shiro Kashimoto, Tsutomu Ishimasa, Noriaki K. Sato
  • Journal Title: Journal of the Physical Society of Japan Volume: 83 Issue: 3 Pages: 034705-034705
  • DOI: 10.7566/jpsj.83.034705
  • Peer Reviewed
• [Journal Article] Quantum critical state in a magnetic quasicrystal (2012)
  • Author(s): K. Deguchi, S. Matsukawa, N. K. Sato, T. Hattori, K. Ishida, H. Takakura, T. Ishimasa
  • Journal Title: Nature Materials Volume: 11 Issue: 12 Pages: 1013-1016
  • DOI: 10.1038/nmat3432
  • Peer Reviewed
• [Presentation] Au-Al-Yb近似結晶における圧力下量子臨界現象 (2014)
  • Author(s): 松川周矢,田中克昌,中山美佳,出口和彦,井村敬一郎,石政勉,佐藤憲昭
  • Organizer: 日本物理学会第69回年次大会
  • Place of Presentation: 東海大学(湘南キャンパス)
  • Year and Date: 2014-03-30
• [Presentation] Au-Al-Yb近似結晶における圧力下量子臨界現象 (2014)
  • Author(s): 松川周矢、田中克昌、中山美佳、出口和彦、井村敬一郎、石政勉、佐藤憲昭
  • Organizer: 日本物理学会第69回年次大会
  • Place of Presentation: 東海大学（湘南キャンパス）
• [Presentation] Tsai型クラスター構造をもつYb系準結晶・近似結晶の磁性と量子臨界現象 (2014)
  • Author(s): 出口和彦、松川周矢、中山美佳、佐藤憲昭、田中克昌、石政勉、三宅厚志、徳永将史
  • Organizer: 日本物理学会第69回年次大会
  • Place of Presentation: 東海大学（湘南キャンパス）
• [Presentation] Au-Al-Yb系準結晶及び近似結晶とAu-Al-Sm系近似結晶の物性研究 (2013)
  • Author(s): 松川周矢,田中克昌,中山美佳,國方翔太,出口和彦,井村敬一郎,松林和幸,上床美也,石政勉,佐藤憲昭
  • Organizer: 日本物理学会2013年秋季大会
  • Place of Presentation: 徳島大学
  • Year and Date: 2013-09-25
• [Presentation] Au-Al-Tm系準結晶および近似結晶の電子輸送特性(2) (2013)
  • Author(s): 中山美佳,松川周矢,井村敬一朗,出口和彦,佐藤憲昭,田中克昌,石政勉
  • Organizer: 日本物理学会2013年秋季大会
  • Place of Presentation: 徳島大学
  • Year and Date: 2013-09-25
• [Presentation] Transport properties of the Au-Al-Yb quasicrystal and approximant under hydrostatic pressure (2013)
  • Author(s): S. Matsukawa, K. Tanaka, M.Nakayama, S. Kunikata, K. Deguchi, K. Imura, T. Ishimasa and N. K. Sato
  • Organizer: 12th International Conference on Quasicrystals (ICQ12)
  • Place of Presentation: AGH University, Krakow, Poland
  • Year and Date: 2013-09-06
• [Presentation] Yb系準結晶及び近似結晶の物性研究 (2013)
  • Author(s): 松川周矢,中山美佳,井村敬一郎,出口和彦,佐藤憲昭,山本真,高倉洋礼,石政勉,松林和幸,上床美也
  • Organizer: 日本物理学会2013年春季大会
  • Place of Presentation: 広島大学
  • Year and Date: 2013-03-27
• [Presentation] Au-Al-Tm系準結晶の電子輸送特性 (2013)
  • Author(s): 中山美佳,松川周矢,井村敬一郎,出口和彦,佐藤憲昭,田中克昌,山本真,田中幸範,高倉洋礼,石政勉
  • Organizer: 日本物理学会2013年春季大会
  • Place of Presentation: 広島大学
  • Year and Date: 2013-03-27
• [Presentation] Transport properties of the Au-Al-Yb quasicrystal and approximant under hydrostatic pressure (2013)
  • Author(s): S. Matsukawa, K. Tanaka, M. Nakayama, S. Kunikata, K. Deguchi, K. Imura, T. Ishimasa and N. K. Sato
  • Organizer: 12th International Conference on Quasicrystals
  • Place of Presentation: AGH University, Krakow, Poland
• [Presentation] Au-希土類系合金における準結晶関連相の形成条件と構造 (2013)
  • Author(s): 田中克昌，田中幸範，石政勉，中山美佳，松川周矢，出口和彦，佐藤憲昭
  • Organizer: 日本物理学会2013年春季大会
  • Place of Presentation: 広島大学
• [Presentation] 磁気準結晶における量子臨界現象 (2013)
  • Author(s): 出口和彦、佐藤憲昭、石政勉
  • Organizer: 日本物理学会2013年春季大会
  • Place of Presentation: 広島大学
  • Invited
• [Presentation] Au-Al-Yb系準結晶の高圧下磁場中電子輸送特性測定 (2012)
  • Author(s): 松川周矢、出口和彦、佐藤憲昭、山本真、高倉洋礼、石政勉
  • Organizer: 日本物理学会2012年秋季大会
  • Place of Presentation: 横浜国立大学