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Spin dynamics of heavy-fermion compound YbCo$$_2$$Zn$$_{20}$$

Kaneko, Koji  ; Yoshiuchi, Shingo*; Takeuchi, Tetsuya*; Honda, Fuminori*; Settai, Rikio*; Onuki, Yoshichika

YbT$$_2$$Zn$$_{20}$$ is known to exhibit heavy-fermion behavior. In particular, YbCo$$_2$$Zn$$_{20}$$ shows extremely large electronic specific coefficient at ambient pressure. In order to get detailed insights into f-electron state in YbCo$$_2$$Zn$$_{20}$$, neutron scattering experiments were carried out. In neutron inelastic spectra at 300 mK, strong quasielastic scattering together with an apparent peak at 0.6 meV was observed. With increasing temperature to 10 K, a broad peak comes up around 2.1 meV, whereas quasielastic response gets broader and the peak at 0.6 meV is buried in the quasielastic one. The observed quasielastic scattering can be ascribed as Kondo-type spin fluctuation with a characteristic energy scale $${Gamma}$$ of 0.3 meV. The observed peaks at 0.6 and 2.1 meV can be assigned as crystal-field excitations. Coexistence of both the quasielastic scattering and the sharp crystal-field excitations characterizes the f-electron state in YbCo$$_2$$Zn$$_{20}$$.

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