Search of new strongly correlated quasicrystals
Project/Area Number |
17K05524
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
Condensed matter physics II
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Research Institution | Toyota Physical and Chemical Research Institute |
Principal Investigator |
Ishimasa Tsutomu 公益財団法人豊田理化学研究所, フェロー事業部門, フェロー (10135270)
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Project Period (FY) |
2017-04-01 – 2020-03-31
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Project Status |
Completed (Fiscal Year 2019)
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Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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Keywords | 準結晶 / 価数揺動 / 量子臨界 / 希土類合金 / 近似結晶 / 新物質 / 正12角形準結晶 / 正20面体準結晶 / Yb合金 / 強相関系 / 金属物性 / 強相関電子系 / 結晶工学 |
Outline of Final Research Achievements |
Quasicrystals are a group of materials with a special long-range order (quasiperiodicity) showing diffraction symmetry different from ordinal crystals such as icosahedral symmetry and 12-fold symmetry. In order to clarify the physical properties originated from such structural specificity, we have conducted research centered on new-substance search. Theoretically, the possibility of a new dodecagonal quasicrystal containing Yb was pointed out using "high-dimensional analysis", and experimentally the first superconductivity (Zn-Mg-Al alloy) in a quasicrystal as well as formation of a new quasicrystal in Zn-Au alloys were discovered. Furthermore, we found phase separation (Cu-Ga-Sc alloy) with a difference in cluster structure, and a difference in electronic state of Yb (Au-Ge-Yb alloy) due to similar difference in the approximant crystals. It is thought that these have brought us one step closer to the goal of “clarifying the physical properties inherent in quasicrystals”.
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Academic Significance and Societal Importance of the Research Achievements |
歴史の区分として,しばしば石器時代,青銅時代,鉄器時代,シリコン時代などを用いますが,これらは全て”結晶の時代”と言うことができます.ところが最近,専門家の間では準結晶と呼ばれる物質群が注目されています.準結晶は,アルミニウム,銅,鉄など,金属の合金として形成しますが,結晶ともアモルファスとも異なる「特別の規則」に従って原子が並んでいるため,従来の金属材料とは異なる「未来材料になりうるような性質」を持っています.ここでは,新物質探索を軸として,そのような準結晶についての基礎研究を行いました.
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Report
(4 results)
Research Products
(39 results)
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[Journal Article] Direct observation of heterogeneous valence state in Yb-based quasicrystalline approximants2017
Author(s)
M. Matsunami, M. Oura, K. Tamasaku, T. Ishikawa, S. Ideta, K. Tanaka, T. Takeuchi, T. Yamada, A.P. Tsai, K. Imura, K. Deguchi, N.K. Sato, T. Ishimasa
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Journal Title
Physical Review B
Volume: 96
Issue: 24
DOI
Related Report
Peer Reviewed
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[Presentation] Valence instability and quantum criticality in Yb-based quasicrystals and approximant crystals2019
Author(s)
K. Imura, S. Yokota, K. Sakamoto, K. Namba, S. Hirokawa, K. Deguchi, H. Yamaoka, Y. Yamamoto, T. Kawai, J. Mizuki, N. Hiraoka, H. Ishii, T. Ishimasa, N.K. Sato
Organizer
Interdisciplinary Symposium for Quasicrystals and Strongly Correlated Electron Systems
Related Report
Int'l Joint Research / Invited
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[Presentation] Tsai型クラスターをもつYb系準結晶・近似結晶の磁性2017
Author(s)
廣川慎之介, 出口和彦, 米山祐樹, 横田晋次郎, 井村敬一郎, 佐藤憲昭, 豊永詞, 石政勉, 山本義哉, 山岡人志, 平岡望, 石井啓
Organizer
日本物理学会2017年秋季大会
Related Report
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