| Budget Amount *help |
¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2021: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2020: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2019: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2018: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
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| Outline of Final Research Achievements |
(1) Au-Al-Yb quasicrystals and approximants are located at a point where the average Yb valence steeply changes. We have found that valence fluctuations, which originate from spin and charge transfer fluctuations, play an important role in quantum critical phenomena in Au-Al-Yb quasicrystals and approximants.
(2) From the view point of chemical pressure, at a small lattice constant (high pressure side), the average Yb valence approaches trivalent state and magnetism appears. On the other hand, magnetism is suppressed at a large lattice constant (low voltage side), but superconductivity appears.
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