Non-Fermi Liquid-Like Behavior in a Heavy Lanthanide Compound YbFe<sub>4</sub>P<sub>12</sub> with Filled Skutterudite Structure Probed by <sup>31</sup>P-NMR

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  • Yamamoto Aya
    Department of Material Science, Graduate School of Science and Technology, Kobe University
  • Wada Shinji
    Department of Material Science, Graduate School of Science and Technology, Kobe University Department of Physics, Faculty of Science, Kobe University
  • Shirotani Ichimin
    Faculty of Engineering, Muroran Institute of Technology
  • Sekine Chihiro
    Faculty of Engineering, Muroran Institute of Technology

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  • Non-Fermi Liquid-Like Behavior in a Heavy Lanthanide Compound YbFe4P12 with Filled Skutterudite Structure Probed by 31P-NMR

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We have carried out 31P-NMR study on a new intermediate-valence compound YbFe4P12 with a filled skutterudite structure which has heavy fermion-like properties below ∼10 K. The Knight shift has a very small value less than 0.05%, and the linewidth exhibits a monotonic increase without exhibiting any singular behavior down to 0.5 K. The nuclear spin–lattice relaxation rate 1⁄T1T below ∼50 K strongly depends on both the temperature T and applied magnetic field H and follows the power-law relation 1⁄T1T=AT−α over one decade. The power α∼0.1 at 7.0 T increases with decreasing H and takes the maximum value of \\simeq0.7 at 0.2 T, which is close to the value 3/4 expected for the non-Fermi liquid (NFL) state associated with antiferromagnetic spin fluctuations. We suggest that YbFe4P12 is an interesting material in which the NFL-like behavior occurs below a rather high temperature of ∼10 K, and a magnetic field of about 0.2 T is sufficient to bring it to its quantum critical point.

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