search for superconductivity in high-Tc candidate materials
| Project/Area Number |
18K04695
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 26020:Inorganic materials and properties-related
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| Research Institution | Yokohama National University |
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Principal Investigator |
Uehara Masatomo 横浜国立大学, 大学院工学研究院, 准教授 (60323929)
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| Project Period (FY) |
2018-04-01 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | 高温超伝導 / Ni酸化物 / ドーピング / 層状化合物 / 高温超伝導候補物質 / Ln4Ni3O8 / superconductivity / layerd Ni oxide / Pd酸化物 / 新超伝導体 |
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| Outline of Final Research Achievements |
In Ni and Pd oxides, we tried to find superconductivity. In Ni oxide, in order to induce superconductivity, the removal of excess oxygen and appropriate carrier tuning are necessary. we achieved the removal of excess oxygen and found that Ni site substitution is promising method for carrier tuning, however appropriate carrier tuning could not be done adquently. In Pd oxide, we found that the carrier tuning is possible by the replacement of O ions by F ions, using NaCl-NaF flux during synthesis. In both compounds, we have reached at just before the appearance of superconductivity and these results are relevant information for realization of superconductivity.
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| Academic Significance and Societal Importance of the Research Achievements |
室温超伝導物質はエネルギー問題解決に資する材料である。現在、常圧下で最高の超伝導転移温度(Tc)を持つ物質は銅酸化物高温超伝導体(HTSC)であり、そのTc は130 Kであるが、電子状態の調整で室温超伝導が発現する可能性がある。しかし機構が完全に解明されていないため、Tc を上げるにための明確な指針は得られていない。
今回の研究で取り上げたNi,Pd酸化物はHTSCと構造・電子状態がよく似ているので超伝導が発現すればHTSCと詳細に比較することによりTc上昇の必須条件が抽出できる。本研究ではNi,Pd酸化物での超伝導発現の一歩手前まで近づき、今後の研究への重要な情報を与えたものである。
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Report
(5 results)
Research Products
(11 results)
