| 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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| 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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