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Effects of Co substitution on the magnetic excitation in heavy fermion compound PrFe$$_{4}$$P$$_{12}$$

重い電子系PrFe$$_{4}$$P$$_{12}$$の磁気励起におけるCo置換効果について

Hao, L.*; 岩佐 和晃*; 小林 広樹*; 中島 健次   ; 河村 聖子   ; 菊地 龍弥  ; Chen, D.*; Liu, Y.*; Liu, Z.*; Li, S.*; Hu, D.*

Hao, L.*; Iwasa, Kazuaki*; Kobayashi, Hiroki*; Nakajima, Kenji; Kawamura, Seiko; Kikuchi, Tatsuya; Chen, D.*; Liu, Y.*; Liu, Z.*; Li, S.*; Hu, D.*

PrFe$$_{4}$$P$$_{12}$$の重い電子系状態と非磁気秩序状態におけるd電子ドープの効果を調べるために、Pr(Fe$$_{1-x}$$Co$$_{x}$$)$$_{4}$$P$$_{12}$$に対して、比熱、及び、中性子非弾性散乱測定を行った。その結果、Co置換がPrイオンの持つ4f電子の秩序化をもたらし、重い電子系状態と磁気秩序を抑える働きがあることがわかった。

We performed measurements of specific heat and inelastic neutron scattering on Pr(Fe$$_{1-x}$$Co$$_{x}$$)$$_{4}$$P$$_{12}$$ to investigate the effects of d-electron doping on the heavy fermion (HF) state and non-magnetic order state of PrFe$$_{4}$$P$$_{12}$$. The ordered state is suppressed by the Co substitution. A Schottky type behavior in the specific eat 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-lastic spectrum in the HF phase of PrFe$$_{4}$$P$$_{12}$$. 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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