| Project/Area Number |
15K06433
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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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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
KAJITA Tetsuya 東北大学, 学際科学フロンティア, 助教 (50729233)
TAKAMATSU Tomohisa 東北大学, 大学院工学研究科, 助教 (60708428)
YAGYU Hotaka 仙台高等専門学校, 電気システム工学科, 助教 (30736369)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Keywords | 超伝導体 / 希土類フリー / ソフト化学合成 / 超伝導 / 銅酸化物 / フッ素 / 低温合成 |
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| Outline of Final Research Achievements |
The purpose of this research is to synthesize new cuprate superconductors without expensive rare earth elements with a superconducting transition temperature Tc above 100 K.
In Sr2-xBaxCuO2F2+d, the maximum Tc is as low as 65 K because the Cu-O distance in the conducting plane is too long for hole carriers to be supplied. In (Bi,Pb)2Sr2CaCu2O8+d, Tc has increased up to 102 K by removing the excess oxygen completely and optimizing the hole concentration. The present compound is the first superconductor with Tc above 100 K in the Bi-2212 phase. In Ca-substituted (RE,Ca)(Ba,Sr)2Cu3O6.0 with reduced RE-content, Tc has increased greatly from 50 K up to 72 K. It has been found that further increase in Tc can be expected by reducing the lattice.
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