2013 Fiscal Year Final Research Report
Research for quantum phase transition in quasicrystals
| Project/Area Number |
24654102
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Condensed matter physics II
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| Research Institution | Nagoya University |
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Principal Investigator |
SATO Noriaki 名古屋大学, 理学(系)研究科(研究院), 教授 (30170773)
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| Co-Investigator(Kenkyū-buntansha) |
ISHIMASA Tsutomu 北海道大学, 大学院工学研究科, 教授 (10135270)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Keywords | 準結晶 / 量子相転移 / 量子臨界現象 |
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| 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.
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