2017 Fiscal Year Final Research Report
Control of the interlayer coupling in iron-based chalcogenide superconductors and application to superconduting devices with tunable properties
| Project/Area Number |
16K13841
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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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 | Aoyama Gakuin University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
鮎川 晋也 岡山大学, 異分野基礎科学研究所, 特任助教 (90625477)
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| Co-Investigator(Renkei-kenkyūsha) |
KOIKE Yoji 東北大学, 工学系研究科, 教授 (70134038)
NOJI Takashi 東北大学, 工学系研究科, 助教 (50180740)
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| Research Collaborator |
OKADA Kazuhiro
OHNUMA Haruka
TAKAGI Tomohiro
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| Project Period (FY) |
2016-04-01 – 2018-03-31
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| Keywords | 鉄カルコゲナイド / 電気化学 / 固有ジョセフソン接合 / インターカレーション / デインターカレーション / 層間制御 |
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| Outline of Final Research Achievements |
Iron-based chalcogenide superconductors attract much attention in novel quantum-mechanical properties, while the crystal structure is the most simple among a family of Fe-based superconductors. In this study, we investigate the application of electrochemical method to monocrystalline superconducting devices, which was considered to be difficult.
We fabricate a narrow bridge structure into Fe(Se,Te) single crystals and confirm both the increase of the superconducting transition temperature and the decrease of the residual resistivity as the time of electrochemical reactions is increased. The microfabrication of monocrystalline devices is useful to reduce the reaction time largely. The application of the electrochemical method to a small junction made of Fe(Se,Te) crystals is found to enhance the hysteretic behavior appeared in the underdamped Josephson junctions. This strongly suggests a possible formation of intrinsic Josephson junctions in Fe(Se,Te) superconductors.
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| Free Research Field |
物性物理、特に超伝導の基礎と応用
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