| 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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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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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 / イオンビーム / 多バンド効果 / スピン軌道相互作用効果 / 物性実験 / 高温超伝導 / ジョセフソン効果 / 鉄カルコゲナイド超伝導体 |
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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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