Structural phase transition in the heavy fermion system Cu_6Ce

重费米子体系Cu_6Ce中的结构相变

• 批准号: 02650470
• 负责人: KOYAMA Yasumasa
• 金额: $ 1.22万
• 依托单位: Waseda University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02650470/
• 关键词: 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

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.

本文用液氮和液氦贮库的透射电子显微术详细研究了重费米子系统CeCu_6的相变晶体学特征。通过离子稀释法制备用于电子显微镜的样品。当温度降低时，在170 K附近出现一维调制结构，而不是迄今报道的正交到单斜的转变。调制结构的特点是调制方向几乎平行于[410]方向，在104 K时其周期约为15 nm。此外，调制结构的外观的物理起源进行了讨论的弹性常数C的晶格软化<66>和晶格缺陷的离子减薄法制备试样过程中引入的。

项目成果

井上 靖秀/松浦 正晴/小山 泰正: "金属間化合物CeCu_6における相転移のTEMを用いた研究" 材研報告. 48. 10-15 (1992)

Yasuhide Inoue/Masaharu Matsuura/Yasumasa Koyama：“利用 TEM 研究金属间化合物 CeCu_6 的相变”材料研究报告 48. 10-15 (1992)。

Y.Inoue M.Matsuura Y.Koyama: "Study of phase transition in intermetallic compound CeCu_6 by means of transmission electron microscopy" Transaction of Laboratory for Materials Science and Technology. 48. 10-15 (1992)

Y.Inoue M.Matsuura Y.Koyama：“通过透射电子显微镜研究金属间化合物CeCu_6的相变”材料科学与技术实验室学报。

Y.Koyama and S.Mori: "Oneーdimensional longーperiod superlattices in alloys" Physical Review B. 44. 7852-7862 (1991)

Y.Koyama 和 S.Mori：“合金中的一维长周期超晶格”物理评论 B. 44. 7852-7862 (1991)