Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima 739-8530, Japan.
Cryogenic and Instrumental Analysis Division, N-BARD, Hiroshima University, Higashi-Hiroshima 739-8526, Japan.
Phys Rev Lett. 2018 Aug 17;121(7):077206. doi: 10.1103/PhysRevLett.121.077206.
Electrical resistivity ρ(T) and specific heat C(T) measurements have been made on the diluted 4f^{2} system Y(Pr)Ir_{2}Zn_{20}. Both data of ρ and magnetic specific heat C_{m} per Pr ion are well scaled as a function of T/T_{0}, where T_{0} is a characteristic temperature of non-Fermi-liquid (NFL) behaviors. Furthermore, the temperature dependences of ρ and C_{m}/T agree with the NFL behaviors predicted by the two-channel Kondo model for the strong coupling limit. Therefore, we infer that the observed NFL behaviors result from the single-site quadrupole Kondo effect due to the hybridization of the 4f^{2} states with multichannel conduction electrons.
已对稀释的 4f^{2}体系 Y(Pr)Ir_{2}Zn_{20}进行了电阻率 ρ(T)和比热 C(T)测量。Pr 离子的 ρ 和磁比热 C_{m}数据均很好地作为 T/T_{0}的函数进行了标度，其中 T_{0}是非费米液体（NFL）行为的特征温度。此外，ρ 和 C_{m}/T 的温度依赖性与强耦合极限下双通道 Kondo 模型预测的 NFL 行为一致。因此，我们推断观察到的 NFL 行为是由于 4f^{2}态与多通道传导电子的杂化导致单站点四极子 Kondo 效应所致。
