2017 Fiscal Year Final Research Report
Strongly Correlated Electrons in Quasicrystals
| Project/Area Number |
15H03685
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Nagoya University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
SATO NORIAKI 名古屋大学, 大学院理学研究科, 教授 (30170773)
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) |
2015-04-01 – 2018-03-31
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| Keywords | 強相関電子系 / 低温物性 / 金属物性 / 磁性 / 超伝導 |
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| Outline of Final Research Achievements |
The Au-Al-Yb quasicrystal with Tsai-type cluster exhibits novel quantum critical phenomena as observed in Yb-based heavy fermion materials with intermediate Yb valence, while the Au-Al-Yb approximant shows heavy Fermi liquid behavior. The quantum critical state of the Au-Al-Yb quasicrystal might correspond to an electronic state unique to the quasicrystals. In the process of material research, we have found superconductivity of Au-Ge-Yb approximants with Tsai-type cluster. Furthermore, we have confirmed the emergence of bulk superconductivity of Al-Zn-Mg quasicrystal at a very low transition temperature [1]. Comparison between the quasicrystal and the approximants demonstrate that the effective interaction between electrons remains attractive under variation of the atomic arrangement. In superconducting quasicrystal, the fractal geometry might interplay with superconductivity: fractal superconductivity.
[1] K. Kamiya, K. Deguchi et al., Nature Communications 9, 154 (2018).
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| Free Research Field |
低温物理・超伝導・磁性
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