| Project/Area Number |
02650470
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Physical properties of metals
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| Research Institution | Waseda University |
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Principal Investigator |
KOYAMA Yasumasa Waseda University School of Science and Engineering Associate Professor, 理工学部, 助教授 (20150295)
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| Project Period (FY) |
1990 – 1992
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| Project Status |
Completed (Fiscal Year 1992)
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| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1992: ¥100,000 (Direct Cost: ¥100,000)
Fiscal Year 1991: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1990: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | Cu_6Ce / Transmission electron microscopy / One-dimensional modulated structure / In-situ observation / CubCe / 変調構造 / 濃度変調 / Cu_6 Ce / 構造相転移 / 透過型電子顕微鏡観察 |
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| Research Abstract |
In the present work, crystallographic features of phase transition in The heavy fermion system CeCu_6 have been in detail investigated by means of transmission electron microscopy equipped with both liquid nitrogen and liquid helium reservoirs. Specimens for electron microscopy were prepared by an ion-thinning method. When the temperature is lowered, a one-dimensional modulated structure appears around 170 K instead of the orthorhombic-to-monoclinic transition reported so far. Features of the modulated structure are that a direction of the modulation is nearly parallel to the [410] direction and its period is about 15 nm at 104 K. Further, a physical origin of the appearance of the modulated structure is discussed in relation to both a lattice softening of the elastic constant C_<66> and lattice defects introduced during the preparation of the specimen by the ion-thinning method.
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