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.
%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
}