| Project/Area Number |
09650719
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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 |
Physical properties of metals
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| Research Institution | HIROSHIMA UNIVERSITY |
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Principal Investigator |
NAKAMICHI Isao Hiroshima University, Faculty of Science, assistance, 理学部, 助手 (40142335)
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| Co-Investigator(Kenkyū-buntansha) |
FUJITA Toshizo Hiroshima University, Graduate School of Advanced Sciences of Matter, Professor, 大学院・先端物質科学研究科, 教授 (20004369)
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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 |
¥3,900,000 (Direct Cost: ¥3,900,000)
Fiscal Year 1998: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1997: ¥3,200,000 (Direct Cost: ¥3,200,000)
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| Keywords | interface / electrical resistance / SQUID / aluminam / dislocation |
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| Research Abstract |
The electrical resistivity measurement of a single boundary using SQUID on zone-refined aluminum at 4.2 K have revealed that the intrinsic boundary resistivity depends on the boundary structure systematically as follows.
1. The specific boundary resistivity ρィイD2gbィエD2 depends on boundary type, which is classified as small-angle, large-angle general, coincidence-related and coherent twin boundaries.
2. ΡィイD2gbィエD2 depends on the rotation angle and is expressed by the following equation except a coherent twin boundary ; θ, tilt angle, φ, twist angle. ΡィイD2gbィエD2 = Asin(θ/2) + Bsin(φ/2).
3. The specific dislocation resistivity ρィイD2dィエD2 obtained from the values A and B for small-angle boundaries, agrees with the ρィイD2dィエD2 in crystals. This shows that the boundary resistivity arises from the dislocations in boundary.
4. Boundary resistivities has a drastic transition at the rotation angle between 22° and 26°, where dislocation cores begin to touch each other.
5. The facts 4 and 5 show that the dislocation resistivity arises from not the strain field but the dislocation core.
6. The fact 2 shows that the dislocation model is applicable to almost all boundaries, against widely-accepted notion.
7. ΡィイD2gbィエD2 of coherent twin boundaries is an order of magnitude smaller than the others, and increases as he boundary plane deviates from {111}. The ρィイD2gbィエD2 is explained to increase with adding partial dislocations on {111} plane.
The co-worker, Fujita has achieved good results of superconductivity on strongly-correlated compounds.
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