Electrical, Magnetic and NMR Studies of Ge-Based Filled Skutterudites $R$Pt4Ge12 ($R=\text{La}$, Ce, Pr, Nd)

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We have synthesized the polycrystalline samples of Ge-based filled skutterudites $R$Pt4Ge12 ($R=\text{La}$, Ce, Pr, Nd) and investigated the lattice constant, electrical resistivity, magnetic susceptibility and nuclear magnetic resonance (NMR) systematically. LaPt4Ge12 is confirmed to be a conventional BCS-type superconductor by the NMR measurements. Additional contribution ascribed to the rattling motion of the La ions has been observed in the nuclear relaxation at the La site at high temperatures. Temperature dependence of the magnetic susceptibility of CePt4Ge12 shows a broad peak around 80 K, which is a typical feature of valence fluctuation systems, whereas PrPt4Ge12 and NdPt4Ge12 show the well-localized nature of $4 f$-electrons. The NMR measurements in CePt4Ge12 revealed that the nuclear spin–lattice relaxation rate $1/T_{1}$ shows an activation-type temperature dependence $1/T_{1}\propto\exp(-\Delta/k_{\text{B}}T)$ with an energy gap $\Delta/k_{\text{B}}=150$ K above 100 K, whereas it is proportional to the temperature below 20 K. This behavior is explained by a pseudogap model originated by the $c$–$ f$ hybridization.

収録刊行物

  • Journal of the Physical Society of Japan

    Journal of the Physical Society of Japan 77(12), 124702-124702-9, 2008-12-15

    一般社団法人日本物理学会

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各種コード

  • NII論文ID(NAID)
    110007021677
  • NII書誌ID(NCID)
    AA00704814
  • 本文言語コード
    EN
  • 資料種別
    ART
  • ISSN
    0031-9015
  • NDL 記事登録ID
    9740999
  • NDL 雑誌分類
    ZM35(科学技術--物理学)
  • NDL 請求記号
    Z53-A404
  • データ提供元
    CJP書誌  NDL  NII-ELS  JPS  JPS 
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