| Project/Area Number |
19K14661
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
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| Research Institution | Aoyama Gakuin University |
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Principal Investigator |
孫 悦 青山学院大学, 理工学部, 助教 (30824180)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Project Status |
Discontinued (Fiscal Year 2021)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | FeSe / superconductivity / micro-fabrication / gating / Fe(Te,Se) / critical current density / ion-gating / iron chalcogenides / micro-structure / band structure |
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| Outline of Research at the Start |
This project will study the high temperature superconductivity in iron chalcogenides via combining the micro-structure fabricating and ion-gating techniques. I will perform transport measurements (resistivity, Hall effect, angle-dependent magnetoresistance, depairing current density, and tunneling spectroscopy) on the micro-structure fabricated Fe(TeSe) EDL device under magnetic field. This project will reveal the evolution of the band structure with the increase of Tc. The key factors directly related to the high temperature superconductivity in FeCh system will be addressed.
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| Outline of Annual Research Achievements |
We have performed a systematical study of the transport properties on a c-axis lamella of FeSe prepared by the FIB pick-up technique. With this lamella, we can put contacts along the c-axis, to directly measure the out-of-plane transport properties. With the decrease of temperature, ρc firstly slightly increases until ~220 K, then decreases, manifesting a hump-like behavior. Such temperature dependent behavior is quite different from the in-plane resistivity ρab, which shows a metallic behavior, continually decreasing with temperature. Besides, we also studied the current-voltage curve, critical current density, upper critical fields, and magnetoresistance to reveal the out-of-plane electrical properties of FeSe.
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