%0 Journal Article %1 doi:10.7566/JPSJ.92.074708 %A Hibino, Ruo %A Yanagisawa, Tatsuya %A Mikami, Yoshito %A Hidaka, Hiroyuki %A Amitsuka, Hiroshi %A Zherlitsyn, Sergei %A Wosnitza, Joachim %A Yamane, Yu %A Onimaru, Takahiro %D 2023 %J J. Phys. Soc. Japan %K b %N 7 %P 074708 %R 10.7566/JPSJ.92.074708 %T Elemental dilution effect on the elastic response due to a quadrupolar Kondo effect of the non-Kramers system Y$_1-x$Pr$_x$Ir$_2$Zn$_20$ %U https://doi.org/10.7566/JPSJ.92.074708 %V 92 %X We measured the elastic constants (C11 − C12)/2 and C44 of the non-Kramers system Y0.63Pr0.37Ir2Zn20 (Pr-37\% system) by means of ultrasound to check how the single-site quadrupolar Kondo effect is modified by increasing the Pr concentration. The Curie-like softening of (C11 − C12)/2 of the present Pr-37\% system on cooling from 5 to 1 K can be reproduced by a multipolar susceptibility calculation based on the non-Kramers Γ3 doublet crystalline-electric-field ground state. Further, on cooling below 0.15 K, a temperature dependence proportional to \(T \) was observed in (C11 − C12)/2. This behavior rather corresponds to the theoretical prediction of the quadrupolar Kondo “lattice” model, unlike that of the Pr-3.4\% system, which shows a logarithmic temperature dependence based on the “single-site” quadrupolar Kondo theory. In addition, we discuss the possibility to form a vibronic state by the coupling between the low-energy phonons and the electric quadrupoles of the non-Kramers doublet in the Pr-37\% system, since we found a low-energy ultrasonic dispersion in the temperature range between 0.15 and 1 K.

@article{doi:10.7566/JPSJ.92.074708, abstract = { We measured the elastic constants (C11 − C12)/2 and C44 of the non-Kramers system Y0.63Pr0.37Ir2Zn20 (Pr-37\% system) by means of ultrasound to check how the single-site quadrupolar Kondo effect is modified by increasing the Pr concentration. The Curie-like softening of (C11 − C12)/2 of the present Pr-37\% system on cooling from 5 to 1 K can be reproduced by a multipolar susceptibility calculation based on the non-Kramers Γ3 doublet crystalline-electric-field ground state. Further, on cooling below 0.15 K, a temperature dependence proportional to \(\sqrt{T} \) was observed in (C11 − C12)/2. This behavior rather corresponds to the theoretical prediction of the quadrupolar Kondo “lattice” model, unlike that of the Pr-3.4\% system, which shows a logarithmic temperature dependence based on the “single-site” quadrupolar Kondo theory. In addition, we discuss the possibility to form a vibronic state by the coupling between the low-energy phonons and the electric quadrupoles of the non-Kramers doublet in the Pr-37\% system, since we found a low-energy ultrasonic dispersion in the temperature range between 0.15 and 1 K. }, added-at = {2023-11-22T18:08:19.000+0100}, author = {Hibino, Ruo and Yanagisawa, Tatsuya and Mikami, Yoshito and Hidaka, Hiroyuki and Amitsuka, Hiroshi and Zherlitsyn, Sergei and Wosnitza, Joachim and Yamane, Yu and Onimaru, Takahiro}, biburl = {https://www.bibsonomy.org/bibtex/28819dff5dfe7a4124fd3319cc5afdc4d/ctqmat}, day = 29, doi = {10.7566/JPSJ.92.074708}, eprint = {https://doi.org/10.7566/JPSJ.92.074708}, interhash = {060dc242f1d131beb5d327091ea475b1}, intrahash = {8819dff5dfe7a4124fd3319cc5afdc4d}, journal = {J. Phys. Soc. Japan}, keywords = {b}, month = {06}, number = 7, pages = 074708, timestamp = {2023-11-22T18:08:19.000+0100}, title = {Elemental dilution effect on the elastic response due to a quadrupolar Kondo effect of the non-Kramers system Y$_{\mathbf{1-x}}$Pr$_{\mathbf{x}}$Ir$_{\mathbf{2}}$Zn$_{\mathbf{20}}$}, url = {https://doi.org/10.7566/JPSJ.92.074708 }, volume = 92, year = 2023 }