| Project/Area Number |
24654104
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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 | Kyoto Institute of Technology |
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Principal Investigator |
HAGIWARA Makoto 京都工芸繊維大学, 工芸科学研究科, 教授 (70198654)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2012: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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| Keywords | 測定原理 / I-V特性 / 非線型電気抵抗 / 電流掃引 / パルス電流 / 発熱制御 / 超伝導転移 / Pr系超伝導体 / 電気抵抗測定 / 微小電気抵抗 / 自己発熱 / 非線型解析 / Fourier解析 / 計測技術 / ３点差分法 / 非線型抵抗 / 銅酸化物超伝導体 / セラミック超伝導体 |
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| Outline of Final Research Achievements |
The study was carried out for the purpose of developing a new measuring technique which can detect accurate I-V characteristics of materials even in their temperature-susceptible transition processes. Patent application was also intended for the technique. Besides, improved synthetic method of Pr-substituted oxides was searched, so as to produce pure Pr247 and Pr124 each independently.
The principle of the realized measurement system is as follows. Pulse height of excitation current for V(I)-observation is swept taking two function values sinθand cosθ by turns, whereθadvances sequentially. This working keeps time-averaged electric power on the sample constant, and so stabilizes the calorific condition against swept current. A patent has been applied for this invention. As for the synthesis of Pr-series materials, it was found effective that the precursor material is obtained using small excess amount of Cu as the ingredient and granules of it is calcined under enough flowing O2 gas.
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