Nano-contact experiments: Energy flow in nano-region and Single molecule magnet
| Project/Area Number |
24540314
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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 |
Condensed matter physics I
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| Research Institution | University of Tsukuba |
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Principal Investigator |
Ootuka Youiti 筑波大学, 数理物質系, 教授 (50126009)
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| Project Period (FY) |
2012-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2012: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | ナノコンタクト / 温度測定 / 熱緩和 / 超伝導ポイントコンタクト / 非平衡状態 / ナノSQUID / 単分子磁石 / 電子温度・格子温度 / 熱伝導 / 単原子・単分子接合 / overheating / 単原子・単分子伝導 / 単分子伝導 / 少数電子素子 |
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| Outline of Final Research Achievements |
By attaching small resistance thermometers to aluminum mechanically-controllable break junction, we measured temperature rise in the immediate vicinities of the nano-contact due to Joule heating at very low temperatures. At the same time we found an evidence of superconductor-to-insulator transition in the I-V curve of the junction, which means the electron temperature exceeds Tc. The rate of temperature rise to heating is about 50 K/microW, which is two- or three- orders of magnitude larger than the values in similar experiments. The temperature rise was independent of the direction of the current through the junction at low-bias conditions, but in some cases it began to depend when the current increased.
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Report
(5 results)
Research Products
(9 results)
