Department of Physics, Hokkaido University, Sapporo 060-0810, Japan.
Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany.
Phys Rev Lett. 2019 Aug 9;123(6):067201. doi: 10.1103/PhysRevLett.123.067201.
Acoustic signatures of the single-site quadrupolar Kondo effect in Y_{0.966}Pr_{0.034}Ir_{2}Zn_{20} are presented. The elastic constant (C_{11}-C_{12})/2, corresponding to the Γ_{3}(E)-symmetry electric-quadrupolar response, reveals a logarithmic temperature dependence of the quadrupolar susceptibility in the low-magnetic-field region below ∼0.3 K. Furthermore, the Curie-type divergence of the elastic constant down to ∼1 K indicates that the Pr ions in this diluted system have a non-Kramers ground-state doublet. These observations evidence the single-site quadrupolar Kondo effect, as previously suggested based on specific-heat and electrical-resistivity data.
呈现了 Y_{0.966}Pr_{0.034}Ir_{2}Zn_{20} 中单点四极 Kondo 效应的声学特征。与 Γ_{3}(E)-对称性电四极响应相对应的弹性常数 (C_{11}-C_{12})/2 在低磁场区域（约 0.3 K 以下）表现出四极磁化率的对数温度依赖性。此外，弹性常数在约 1 K 以下的居里型发散表明，在这个稀释系统中，Pr 离子具有非克鲁梅尔基态二重态。这些观察结果证明了单点四极 Kondo 效应，这与之前基于比热和电阻率数据的推测一致。
