| Project/Area Number |
09650365
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Electronic materials/Electric materials
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| Research Institution | Kagoshima University |
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Principal Investigator |
HORIE Yuuji Kagoshima University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (50201760)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1997: ¥2,700,000 (Direct Cost: ¥2,700,000)
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| Keywords | Oxide Superconductor / Flux Pinning / Ultrasound / Thin Film / Flux Flow / Piezoelectricity |
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| Research Abstract |
This project was schemed as a two-year plan. However, the preparation of multilayered thin films was not succeeded, because the fabrication of the equipment of the laser ablation was delayed from the initial plan. In parallel to the fabrication, BiSrCaCuO thin films were prepared using a dc sputtering, and the flux flow voltage excited by ultrasound was measured. The experimental results which will give some information for the measurements using thin films of superconductor-piezoelectric materials were obtained as follows :
1. The effects of buffer layers on the crystallinity and superconductivity of BiSrCaCuO layer were studied to get high quality thin films. The buffer layers were found to reduce the strain caused by the lattice mismatch between the films and the substrates, and improve the superconducting transition temperature and the roughness of the film surface.
2. The magnetic flux flow voltage excited by longitudinal ultrasound was measured for the above thin films and the bulk sintered samples. The experimental results were compared with theoretical ones based on the model of thermally assisted flux flow, and the problems to be solved were pointed out.
3. The flux flow voltage was measured with a different vibrational mode of ultrasound which is related to the melting of the flux line lattice. A characteristic phenomenon was observed for the flux flow voltage.
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