Effects of Co Substitution on the Magnetic Excitation in Heavy Fermion Compound PrFe4P12

We performed measurements of specific heat and inelastic neutron scattering on Pr(Fe1-xCox)4P12 to investigate the effects of d-electron doping on the heavy fermion (HF) state and non-magnetic order state of PrFe4P12. The ordered state is suppressed by the Co substitution. A Schottky type behavior in the specific-heat appears at 8 K, in contrast with the undoped system. The inelastic neutron spectrum of the Co substituted system is composed of several sharp inelastic peaks, in contrast with the quasi-elastic spectrum in the HF phase of PrFe4P12. The experimental results indicate that the Co substitution induces localized 4f electrons of Pr ions with suppression of the HF state and the exotic ordering.

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