| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2011: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2010: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2009: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Research Abstract |
In this work, I have studied on odd frequency Cooper pairs at junction interfaces between a ferromagnet and a superconductor. I have clarified several topics as follows:
1. I synthesized Heusler alloys Co_<2-x> Fe_xMnSi and Ru_<2-x> Fe_xCrSi, which are expected as half-metal by the first-principles band calculations. Those materials are candidates of half-metal.
2. The spin polarization of Co_<2-x> Fe_xMnSi is independent of composition x and is equal to approximately 50%.
3. The spin polarization of Ru_<2-x> Fe_xCrSi is maximum value of 63% in the case of x=1. 8.
4. I succeed in fabricating fully-epitaxial NbN/Co_2MnSi and NbN/Co_2FeSi bilayers and those nano-junctions in order to trap the odd frequency Cooper pairs.
5. I observed a large zero-bias peak in differential conductance of NbN/Co_2MnSi nano-junctions. The phenomenon are not explained by the modified Blonder-Tinkham-Klapwijk(BTK) model and indicates generations of odd frequency pairs at the junction interface.
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