高濃度近藤系化合物ＹｂＣｕ５－ｘＡｇｘの磁気的，電気的性質

• 辻井 直人

  京都大学大学院理学研究科化学

• 何 軍輝

  京都大学大学院理学研究科化学

• 吉村 一良

  京都大学大学院理学研究科化学

• 小菅 皓二

  京都大学大学院理学研究科化学

• Michor Herwig

  Institute für Experimentalphysik, Techniche Universität Wien

• Kreiner Klaus

  Institute für Experimentalphysik, Techniche Universität Wien

• Hilscher Gerfried

  Institute für Experimentalphysik, Techniche Universität Wien

書誌事項

タイトル別名

• Magnetic and Electrical Properties of a Dense Kondo System YbCu5-xAgx.
• コウ ノウド コンドウケイ カゴウブツ YbCu5-xAgx ノ ジキテキ デ

抄録

YbCu₄Ag crystallizes in the cubic AuBe₅-type structure where Yb is trivalent and shows dense Kondo behavior, while YbCu₅ is known to have the hexagonal CaCu₅-type structure where Yb is in a nonmagnetic divalent state. In this study, a pseudo-binary system YbCu_5-xAg_x was investigated. The powder Xray diffraction revealed that YbCu_5-xAg_x has the cubic AuBe₅-type structure in the range of 0.125≤x≤1.0, while both the cubic and the hexagonal phase exist for 0≤x≤0.1, which suggests YbCu₅ has also cubic AuBe₅-type where Yb seems to be trivalent. Magnetic and transport properties show that YbCu_5-xAg_x is a dense Kondo system in which Kondo-temperature T_K decreases continuously with the decrease of Ag-concentration x, causing the enhancement of the zerotemperature susceptibility x(O), the T²-coefficient A of electrical resistivity and the Sommerfeld coefficient γ of specific heat. The γ value was found to be enhanced to as large as 460mJ/mo1K² in YbCu_4.875Ag_0.125. These results imply the cubic AuBe₅-type YbCu₅ is a dense-Kondo or a heavy-fermion system, in which γ reaches to about 500mJ/molK².

収録刊行物

• 粉体および粉末冶金

  粉体および粉末冶金 43 (8), 1030-1035, 1996

  一般社団法人 粉体粉末冶金協会

キーワード

• YbCu<SUB>5</SUB>
• YbCu<SUB>4</SUB>Ag
• dense kondo system
• heavy-fermion
• AuBe<SUB>5</SUB>-type structure

詳細情報

• CRID: 1390282681284420480
• NII論文ID: 10002012899
• NII書誌ID: AN00222724
• DOI: 10.2497/jjspm.43.1030
• ISSN: 18809014
• ISSN: 05328799
• NDL書誌ID: 4012529
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4012529
• 本文言語コード: ja
• データソース種別:
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  • NDL
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• 抄録ライセンスフラグ: 使用不可