Evidence for Ferromagnetic Fluctuations in Filled Skutterudite LaFe4Sb12:Sb-NQR and La-NMR

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著者

    • Sugawara Hitoshi
    • <sup>1</sup>Faculty of Integrated Arts and Sciences, The University of Tokushima, Tokushima 770-8502
    • Mori Ikuko
    • <sup>1</sup>Faculty of Integrated Arts and Sciences, The University of Tokushima, Tokushima 770-8502
    • Saito Takahito
    • <sup>1</sup>Faculty of Integrated Arts and Sciences, The University of Tokushima, Tokushima 770-8502
    • Koyama Kuniyuki
    • <sup>1</sup>Faculty of Integrated Arts and Sciences, The University of Tokushima, Tokushima 770-8502

抄録

We report the results of 121,123Sb-nuclear quadrupole resonance (NQR) and 139La-NMR measurements on a filled skutterudite antimonide LaFe4Sb12 in order to investigate the magnetic properties at low temperatures from a microscopic point of view. The nuclear spin–lattice relaxation time <TEX>$T_{1}$</TEX>of Sb nuclei deviates from the relation <TEX>$T_{1}T$</TEX>= constant above 4.2 K, where <TEX>$1/T_{1}T$</TEX>has a Curie–Weiss temperature dependence <TEX>$1/T_{1}T = C/(T+\theta)$</TEX>with <TEX>$\theta \sim 30$</TEX>K. The temperature dependence of the Knight shift of 139La nuclei, which is related to the susceptibility at <TEX>$q = 0$</TEX>, is scaled to that of <TEX>$1/T_{1}T$</TEX>above 40 K. This relation strongly suggests that ferromagnetic fluctuations are predominant in LaFe4Sb12. We also point out that LaFe4Sb12 is situated close to the ferromagnetic instability due to the small Weiss temperature in the Curie–Weiss behavior of <TEX>$1/T_{1}T$</TEX>and the Knight shift.

収録刊行物

  • Journal of the Physical Society of Japan

    Journal of the Physical Society of Japan 75(2), 023701-023701-4, 2006-02-15

    一般社団法人日本物理学会

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  • Evidence for

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各種コード

  • NII論文ID(NAID)
    110004086853
  • NII書誌ID(NCID)
    AA00704814
  • 本文言語コード
    EN
  • 資料種別
    SHO
  • ISSN
    0031-9015
  • NDL 記事登録ID
    7812777
  • 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  J-STAGE  JPS  JPS 
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