de Haas-van Alphen effect and Fermi surface properties in high-quality single crystals YbCu2Si2 and YbCu2Ge2
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- Dung Nguyen Duc
- Graduate School of Science, Osaka University Advanced Science Research Center, Japan Atomic Energy Agency
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- Matsuda Tatsuma D.
- Advanced Science Research Center, Japan Atomic Energy Agency
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- Haga Yoshinori
- Advanced Science Research Center, Japan Atomic Energy Agency
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- Ikeda Shugo
- Advanced Science Research Center, Japan Atomic Energy Agency
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- Yamamoto Etsuji
- Advanced Science Research Center, Japan Atomic Energy Agency
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- Ishikura Tatsuro
- Graduate School of Science, Osaka University
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- Endo Toyoaki
- Graduate School of Science, Osaka University
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- Tatsuoka Sho
- Department of Physics, Tokyo Metropolitan University
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- Aoki Yuji
- Department of Physics, Tokyo Metropolitan University
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- Sato Hideyuki
- Department of Physics, Tokyo Metropolitan University
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- Takeuchi Tetsuya
- Graduate School of Science, Osaka University Low Temperature Center, Osaka University
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- Settai Rikio
- Graduate School of Science, Osaka University
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- Harima Hisatomo
- Department of Physics, Faculty of Science, Kobe University
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- Onuki Yoshichika
- Graduate School of Science, Osaka University Advanced Science Research Center, Japan Atomic Energy Agency
書誌事項
- タイトル別名
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- de Haas–van Alphen Effect and Fermi Surface Properties in High-Quality Single Crystals YbCu<SUB>2</SUB>Si<SUB>2</SUB> and YbCu<SUB>2</SUB>Ge<SUB>2</SUB>
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We succeeded in growing high-quality single crystals of a valence fluctuating compound YbCu2Si2 and a divalent compound YbCu2Ge2. The magnetic susceptibility of YbCu2Si2 follows the Curie–Weiss law with Yb3+ at high temperatures, but reveals a broad peak around 40 K for H||[100], which is due to the formation of a 4f-itinerant heavy fermion state at lower temperatures. This is also reflected in the temperature dependence of Hall coefficient, thermoelectric power and thermal expansion. The corresponding de Haas–van Alphen (dHvA) branches are approximately explained by the 4f-itinerant LDA band model, and the 4f-itinerant LDA+U model is found to be much applicable to the dHvA data. The cyclotron effective masses of main Fermi surfaces are relatively large, being 30–40 m0, which is consistent with the electronic specific heat coefficient γ=150 mJ/(K2·mol). These results indicate that the localized 4f electrons at high temperatures become itinerant at low temperatures, forming a narrow renormalized conduction band. On the other hand, YbCu2Ge2 is a divalent compound, indicating a Pauli paramagnetic susceptibility and a small γ value of 9–10 mJ/(K2·mol). The corresponding 4f bands in YbCu2Ge2 are located below the Fermi energy, and do not contribute to the Fermi surfaces. The dHvA data are thus well explained by the Yb2+ band model. These Fermi surfaces in YbCu2Si2 and YbCu2Ge2 are highly different from the Fermi surfaces of a non-4f reference compound YCu2Si2 and a 4f-closed reference compound LuCu2Si2.
収録刊行物
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- Journal of the Physical Society of Japan
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Journal of the Physical Society of Japan 78 (8), 084711-084711, 2009
一般社団法人 日本物理学会
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詳細情報 詳細情報について
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- CRID
- 1390282679173891456
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- NII論文ID
- 130005437800
- 40016692862
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- NII書誌ID
- AA00704814
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- ISSN
- 13474073
- 00319015
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- NDL書誌ID
- 10317338
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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