Investigation for anormalous superconducting critical temperature behavior of superconductor/normalconductor alternately-layered thin films
| Project/Area Number |
21560689
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Physical properties of metals
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| Research Institution | Kyoto University (2011)
Kagoshima University (2009-2010) |
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Principal Investigator |
DOI Toshiya 京都大学, 大学院・エネルギー科学研究科, 准教授 (30315395)
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| Project Period (FY) |
2009 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2011: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2010: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2009: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Keywords | 超伝導材料・素子 / 金属物性 / 結晶工学 / 超伝導 / 超電導 / 二ホウ化マグネシウム / MgB_2 / 臨界温度 / T_c / 二ホウ素化マグネシウム / Tc / 多層膜 |
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| Research Abstract |
We fabricated M_gB2 thin films with various thickness on several kinds of substrates. We found that the superconducting critical temperature(T_c) of the thicker films have higher Tc than those of the thinner ones. The reason of these lower T_c for the thinner films was their poorer crystallinity. These results suggest that the Tc of the superconductor/normalconductor alternately-layered thin film was influenced by the crystallinity of the superconducting layer. However, since the columnar M_gB2 crystals of the M_gB2 layers separated by the inserted Ni-layers were confirmed to grow continuously and epitaxially through the separating Ni-layers from a cross-sectional transmission electron microscope observation, other factors are also to govern the Tc of the M_gB2/Ni alternately-layered thin film. We also found that the M_gB2 thin films have a very high critical current density(J_c) over 10 MA/_<cm> 2 at 10 K when they were grown with small grain size of few tens nm. We believe that such a high Jc value may open a new way to fabricate a practical superconducting wire.
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Report
(4 results)
Research Products
(8 results)
