| Budget Amount *help |
¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2012: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Outline of Final Research Achievements |
The pseudogap state in cuprate superconductors has been attracted, since it is an unusual elctronic phase characterizing the complex phase diagram in them. In this study, we measured the interlayer tunneling spectra for small intrinsic Josephson junctions (IJJs) fabricated from crystalline cuprate superconductors by using focused ion beam (FIB) techniques, and tried to observe the pseudogap in the differential conductance spectra and to reduce the self-heatings giving serious influences to the measured spectra. We succeeded in fabricating small IJJs with lateral area of 1 micrometer squared and a small number of juctions less than 10, by using only FIB techniques, and in observing a clear signature of the pseudogap in the measured spectra. We also obtained a prospect on a short pulse method, which can more effectively reduce the self-heatings to obtain more precise spectra.
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