Application of the micro-fabrication technique to the study of nematicity and superconductivity
Publicly Offered Research
Project Area | Physical Properties of Quantum Liquid Crystals |
Project/Area Number |
20H05164
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Research Category |
Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
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Allocation Type | Single-year Grants |
Review Section |
Science and Engineering
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Research Institution | Aoyama Gakuin University |
Principal Investigator |
孫 悦 青山学院大学, 理工学部, 助教 (30824180)
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Project Period (FY) |
2020-04-01 – 2022-03-31
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Project Status |
Discontinued (Fiscal Year 2021)
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Budget Amount *help |
¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2021: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2020: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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Keywords | depairing Jc / FeSe / FIB fabrication / nematicity / superc onductivity / micro-fabrication / nematic phase / superconductivity / FIB |
Outline of Research at the Start |
The micro-fabrication technique will be applied to reduce the size of crystal into single domain, and control the shape and geometry for the study of superconductivity and nematicity. In the fabricated devices, transport measurements will be performed to study nematicity, in the whole temperature region from the normal state (e.g. resistivity and magnetoresistance) to the superconducting state (e.g. depairing Jc). Our research will overcome the difficulty of controlling the sample's shape and direction, and open a new route to probe the relation between nematicity and superconductivity.
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Outline of Annual Research Achievements |
We sucessfully achieved the depairing Jc in a narrow bridge of FeSe single crystal fabricated by the FIB pick-up technique. Width of the narrow bridge is reduced in sequence from 1.125 μm to 0.388 μm, which is larger and smaller than the value of Pearl length (Λ ~ 0.62 μm), respectively. Jc is directly estimated from the transport current-voltage measurements, which reaches a very large value about one order of magnitude larger than the depinning Jc estimated from the magnetic hysteresis loops (MHLs). Furthermore, the value of Jc is found to be increased more than twice simply by reducing W from 1.125 μm to 0.388 μm, which supports the achievement of depairing Jc. We also measured the Jc under magnetic fields. Jc of the narrow bridge is found to be much stable against magnetic field than that of the bulk sample. The field-insensitive Jc can be understood by the large increase of lower critical field, Hc1, when W is reduced to be comparable to λ
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Research Progress Status |
令和3年度が最終年度であるため、記入しない。
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Strategy for Future Research Activity |
令和3年度が最終年度であるため、記入しない。
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Report
(2 results)
Research Products
(13 results)