Evidence for the Single-Site Quadrupolar Kondo Effect in the Dilute non-Kramers System Y${}_{1-x}$Pr${}_x$Ir${}_2$Zn${}_{20}$

Abstract

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.

arXiv comment5 pages, 4 figures (+ Supplemental Material: 5 pages, 4 figures)

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• Simultaneous collapse of antiferroquadrupolar order and superconductivity in PrIr${}_2$Zn${}_{20}$ by nonhydrostatic pressure
• Quadrupolar Susceptibility and Magnetic Phase Diagram of PrNi${}_2$Cd${}_{20}$ with Non-Kramers Doublet Ground State
• Inelastic neutron scattering study of crystalline electric field excitations in the caged compounds NdT2Zn20 (T = Co, Rh, and Ir)
• Divergent Thermal Expansion and Grüneisen Ratio in a Quadrupolar Kondo Metal
• Analysis of Magnetoacoustic Quadrupole Resonance and Application to Probe Quadrupole Degrees of Freedom in Quantum Magnets
• 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${}_{20}$
• Catalog of cubic, symmetry-protected, non-Fermi liquid, Kondo-type exchange models for doublet impurities
• Elastic Response in the Dilute non-Kramers System Y${}_{1-x}$Pr${}_x$Ir${}_2$Zn${}_{20}$
• Paramagnetic electron-nuclear spin entanglement in HoCo2Zn20
• Search for magnetoacoustic quantum oscillations in the insulating phase of YbB${}_{12}$
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