| Project/Area Number |
13640360
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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 |
固体物性Ⅱ(磁性・金属・低温)
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| Research Institution | Department of Physics, Nagoya University |
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Principal Investigator |
MIURA Yuichi Nagoya University, Department of Physics, Associate Professor, 大学院・理学研究科, 助教授 (30175608)
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| Project Period (FY) |
2001 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2002: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2001: ¥2,400,000 (Direct Cost: ¥2,400,000)
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| Keywords | Solid ^3He / Fermi solid / Dislocation Motion / Quantum effect / Melting Point |
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| Research Abstract |
The dislocation motion in most quantum solid, bcc solid ^3He, has been studied. The dislocation line begins to move when the applied strain exceeds the critical value. Solid ^3He is almost an ideal crystal for the study of the dislocation motion because of the facts that the impurities can be removed down to 0.001 ppm and the Peierls potential is tunable by changing the molar-volume of the solid. Therefore, it is possible to study the dislocation motion without the pinning by the impurities.
We have measured the shear modulus and the energy dissipation using the high-Q torsional oscillator technique as a function of the strain amplitude. Our oscillator is found to be so sensitive that the shear modulus and the dissipation can be measured at the strain amplitude ranging from 10^<-5> down to 10^<-8>. The molar-volume dependence of the Peieris potential is determined. The pinning effect by the dislocation network nodes is observed. And the anomaly of the shear modulus which is a feature of the solid state has been observed near the melting point.
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