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

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  • Magishi Ko-ichi
    Faculty of Integrated Arts and Sciences, The University of Tokushima
  • Nakai Yusuke
    Department of Physics, Graduate School of Science, Kyoto University
  • Ishida Kenji
    Department of Physics, Graduate School of Science, Kyoto University
  • Sugawara Hitoshi
    Faculty of Integrated Arts and Sciences, The University of Tokushima
  • Mori Ikuko
    Faculty of Integrated Arts and Sciences, The University of Tokushima
  • Saito Takahito
    Faculty of Integrated Arts and Sciences, The University of Tokushima
  • Koyama Kuniyuki
    Faculty of Integrated Arts and Sciences, The University of Tokushima

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  • Evidence for Ferromagnetic Fluctuations in Filled Skutterudite LaFe<sub>4</sub>Sb<sub>12</sub>:Sb-NQR and La-NMR

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Abstract

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 T1 of Sb nuclei deviates from the relation T1T = constant above 4.2 K, where 1⁄T1T has a Curie–Weiss temperature dependence 1⁄T1T=C⁄(T+θ) with θ∼30 K. The temperature dependence of the Knight shift of 139La nuclei, which is related to the susceptibility at q=0, is scaled to that of 1⁄T1T 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 1⁄T1T and the Knight shift.

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