| Project/Area Number |
25610094
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Condensed matter physics II
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| Research Institution | Nagoya University |
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Principal Investigator |
DEGUCHI Kazuhiko 名古屋大学, 理学(系)研究科(研究院), 助教 (40397584)
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Keywords | 量子臨界現象 / 準結晶 / 磁性 / 強相関電子系 / 極低温 / 高圧 |
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| Outline of Final Research Achievements |
One of the purposes of this research is to search new physical phenomena in the magnetic quasicrystal of a strongly correlated electron system with Tsai-type clusters. First, we report the emergence of bulk superconductivity in Au-Ge-Yb approximants (AGY(I) and AGY(II)) below 0.68 and 0.36 K, respectively. This is the first observation of superconductivity in Tsai-type crystalline approximants of quasicrystals. We also present a structure model refined by Rietveld analysis for X-ray diffraction data. The Tsai-type cluster center is occupied by Au and Ge ions in the former approximant, and by an Yb ion in the latter. For magnetism, the latter system shows a larger magnetization than the former. To explain this observation, we propose a model that the cluster-center Yb ion is magnetic.
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