| Project/Area Number |
08640463
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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 | HIROSHIMA UNIVERSITY |
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Principal Investigator |
UEDA Yoshitake Faculty of Science, HIROSHIMA UNIVERSITY Research Assistant, 理学部, 助手 (80106799)
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| Co-Investigator(Kenkyū-buntansha) |
HASHIMOTO Eiji Hiroshima Syncrotron Radiation Center, HIROSHIMA UNIVERSITY Assistant Professor, 放射光科学研究センター, 助教授 (50033907)
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| Project Period (FY) |
1996 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1997: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1996: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Keywords | ballistic region / quantum interference effect / high-purity metal crystal / magnetoresistance / magnetic-breakdown / 磁気抵抗 |
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| Research Abstract |
Current-orientation dependence of bulk residual resistivity, negative bend resistance and nonlinear I-V characteristics have been observed in ultrahigh-purity aluminium single crystals at 4.2K.
In this project, further, quantum oscillations due to magnetic breakdown in the transverse magnetoresistance have been measured on single crystals of ultrahigh-purity aluminium at 4.2K.In a specimen with the [110] current direction, monotonically increasing oscillations superimposed on the linear increase of magnetoresistivity are observed in magnetic fields up to B = 4.0 T directed in the [001] crystallographic orientation. On the other hand, in a specimen with the [100], current direction, the bottom and the top of the oscillations and their amplitude have been found to increase stepwise every three cycles with increasing magnetic fields, while the amplitude increases monotonically among three cycles. For this current direction, also a sudden increase and decrease in the period DELTA (1/B) of the oscillations against 1/B have been observed around the mean value of 2.15 * 10^<-2> T^<-1> every six cycles. It is suggested that these stepwise changes of the oscillations arises from a new quantum interference effect of electron waves.
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