Superconducting properties of Pr-based filled skutterudite PrRu4As12
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- Namiki Takahiro
- Faculty of Engineering Science, Muroran Institute of Technology
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- Aoki Yuji
- Department of Physics, Graduate School of Science, Tokyo Metropolitan University
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- Sato Hideyuki
- Department of Physics, Graduate School of Science, Tokyo Metropolitan University
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- Sekine Chihiro
- Faculty of Engineering Science, Muroran Institute of Technology
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- Shirotani Ichimin
- Faculty of Engineering Science, Muroran Institute of Technology
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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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- Yagi Takehiko
- Institute for Solid State Physics, University of Tokyo
書誌事項
- タイトル別名
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- Superconducting Properties of Pr-Based Filled Skutterudite PrRu<SUB>4</SUB>As<SUB>12</SUB>
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説明
We report on a systematic study of the superconducting characteristics and Pr crystalline-electric-field (CEF) levels of the filled skutterudite PrRu4As12 (Tc=2.33 K). The temperature dependences of the upper critical field Hc2 and the Ginzburg–Landau (Maki) parameter κ2 suggest s-wave clean-limit superconductivity. The electronic specific heat coefficient γ∼95 mJ/(K2·mol), which is ∼1.5 times larger than that of LaRu4As12, indicates 4f-originating quasiparticle mass enhancement. The magnetic susceptibility χ(T) indicates that the CEF ground state is a Γ1 singlet and a Γ4(1) triplet first excited state lies at ΔCEF∼30 K above. A systematic comparison among PrOs4Sb12, PrRu4Sb12, PrRu4As12, and La-based reference compounds suggests that the inelastic exchange scattering and aspherical charge scattering of conduction electrons from CEF-split 4f levels play an essential role in the quasiparticle mass enhancement and in determining the value of Tc in the Pr-based filled skutterudites.
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 76 (9), 093704-093704, 2007
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
- 1390001204196563328
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- NII論文ID
- 130005296989
- 110006418592
- 210000106867
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- NII書誌ID
- AA00704814
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- ISSN
- 13474073
- 00319015
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- NDL書誌ID
- 8907021
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- 本文言語コード
- en
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