| Project/Area Number |
15K13516
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Condensed matter physics II
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
Okuma Satoshi 東京工業大学, 理学院, 教授 (50194105)
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| Co-Investigator(Renkei-kenkyūsha) |
KANEKO Shin-ichi 東京工業大学, 理学院, 助教 (40301171)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2015: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | 超伝導渦糸 / 非平衡ダイナミクス / 動的相転移 / プラスチックフロー / 動的融解 / 異方的格子 / 自己組織化 / せん断力 / 渦糸 / ピニング / 動的秩序化 |
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| Outline of Final Research Achievements |
By preparing anisotropic vortex lattices, which cannot be realized in ordinary solids, under an applied field tilted from the normal to the plane of a superconducting film, we study a dynamic-melting phenomenon of the fast driven lattices associated with an increase in the vortex density, using a mode-locking technique. The results show that a melting condition of the anisotropic lattices is determined only by the shorter side of the distorted lattices regardless of the shape of the lattices. In contrast, vortex assemblies with disordered initial configuration become gradually ordered under the application of ac drive. By developing two-step measurements of transient voltage responses, we find that the vortex configuration during the dynamic ordering is separated into disordered and ordered regions and that the ratio of the disordered region increases with the number of cycles.
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