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Evidence for the Single-Site Quadrupolar Kondo Effect in the Dilute non-Kramers System Y_(1-x)Pr_xIr₂Zn₂₀
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Evidence for the Single-Site Quadrupolar Kondo Effect in the Dilute non-Kramers System Y_(1-x)Pr_xIr₂Zn₂₀
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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 $\Gamma_3$(E)-symmetry electric-quadrupolar response, reveals a logarithmic temperature dependence of the quadrupolar susceptibility in the low-magnetic-field region below $\sim$0.3 K. Furthermore, the Curie-type divergence of the elastic constant down to $\sim$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.
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