Magnetic Excitations in Heavy Electron State of Filled Skutterudite Pr_xLa_<1-x>Fe_4P_<12> (x=1.00 and 0.85)(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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PrFe_4P_<12> exhibits clear heavy electron behaviors as well as the phase transition to an antiferro-type ordering of 4f electron state. In this paper, we report on inelastic neutron scattering results for powdered samples of Pr_xLa_<1-x>Fe_4P_<12> (x=1.00 and 0.85). A clear quasielastic magnetic response is observed, and no distinct signal is seen for crystal-field (CF) excitations in the heavy electron state. A model with strong hybridization between conduction electrons and Pr^<3+> 4f^2 electrons [J. Otsuki et al.: J. Phys. Soc. Jpn. 74 (2005) 200 and 2082] is consistent with the observed magnetic response. This result shows that the heavy electron behavior of Pr_xLa_<1-x>Fe_4P_<12> (x=1.00 and 0.85) originates from the Kondo effect associated with low-lying singlet-triplet CF states.
社団法人日本物理学会の論文
2008-06-15