Development of new measurement technique which can detect accurate I-V characteristics of superconductors in their fluctuated transition processes

2014 Fiscal Year Final Research Report

• Project/Area Number: 24654104
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics II
• Research Institution: Kyoto Institute of Technology
• Principal Investigator: HAGIWARA Makoto 京都工芸繊維大学, 工芸科学研究科, 教授 (70198654)
• Project Period (FY): 2012-04-01 – 2015-03-31
• 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

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.

Free Research Field

物理学