Magnetic Excitations in Heavy Electron State of Filled Skutterudite Pr<I><SUB>x</SUB></I>La<SUB>1−<I>x</I></SUB>Fe<SUB>4</SUB>P<SUB>12</SUB> (<I>x</I>=1.00 and 0.85)

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  • Magnetic excitations in heavy electron state of filled skutterudite Pr[x]La1-xFe4P12 (x= 1.00 and 0.85)
  • Magnetic Excitations in Heavy Electron State of Filled Skutterudite Pr<sub><i>x</i></sub>La<sub>1-<i>x</i></sub>Fe<sub>4</sub>P<sub>12</sub> (<i>x</i> = 1.00 and 0.85)

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PrFe4P12 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 PrxLa1−xFe4P12 (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 Pr3+ 4f2 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 PrxLa1−xFe4P12 (x=1.00 and 0.85) originates from the Kondo effect associated with low-lying singlet–triplet CF states.

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