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Elemental Dilution Effect on the Elastic Response due to a Quadrupolar Kondo Effect of the Non-Kramers System Y1−xPrxIr2Zn20.
- Source :
- Journal of the Physical Society of Japan; 7/15/2023, Vol. 92 Issue 7, p1-8, 8p
- Publication Year :
- 2023
-
Abstract
- We measured the elastic constants (C<subscript>11</subscript> − C<subscript>12</subscript>)/2 and C<subscript>44</subscript> of the non-Kramers system Y<subscript>0.63</subscript>Pr<subscript>0.37</subscript>Ir<subscript>2</subscript>Zn<subscript>20</subscript> (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 (C<subscript>11</subscript> − C<subscript>12</subscript>)/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 Γ<subscript>3</subscript> doublet crystalline-electric-field ground state. Further, on cooling below 0.15 K, a temperature dependence proportional to \(\sqrt{T} \) was observed in (C<subscript>11</subscript> − C<subscript>12</subscript>)/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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00319015
- Volume :
- 92
- Issue :
- 7
- Database :
- Complementary Index
- Journal :
- Journal of the Physical Society of Japan
- Publication Type :
- Academic Journal
- Accession number :
- 164707311
- Full Text :
- https://doi.org/10.7566/JPSJ.92.074708