| Project/Area Number |
16K17739
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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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 | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Keywords | 機械的剥離法 / 薄膜 / 超伝導 / 原子層超伝導 / 鉄系超伝導 / 鉄系超伝導体 / 超伝導材料・素子 / 超薄膜 |
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| Outline of Final Research Achievements |
In this study, FeSe (iron-based superconductor) thin-film devices with the thickness of the order of < 200 nm were successfully fabricated by using mechanical exfoliation. This method was also applicable for a few tens of nanometer-thick graphite samples, and those devices were measured under high-magnetic field up to 35 T in National High Magnetic Field Laboratory, US. The results were reported in Physical Review B. For electrochemical etching in order to thinning devices down to several layers of thickness, horizontal helium-flow cryostat was developed. This machine enables to etch and measure down to cryogenic temperature without exposing the samples to ambient environment.
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| Academic Significance and Societal Importance of the Research Achievements |
機械的剥離法を用いた数十ナノメートル厚さの微結晶に対して、電子線リソグラフィを用いたデバイス作製と輸送特性評価が可能であることが示された。また、イオン液体による電気化学エッチングが簡便に行いながらヘリウム温度までの低温電気抵抗測定がin-situで行える横型クライオスタットを開発し、今後様々な積層構造をもつ結晶に対して同様の手法が適用できると考えられ、本手法が普及することが期待される。
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