Divergent Thermal Expansion and Grüneisen Ratio in a Quadrupolar Kondo Metal

Abstract

We report on the low-temperature thermal expansion and magnetostriction of the single-impurity quadrupolar Kondo candidate Y${}_{1-x}$Pr${}_x$Ir${}_2$Zn${}_{20}$. In the dilute limit, we find a quadrupolar strain that possesses a singular dependence on temperature $T$, ${\epsilon }_{\mathrm{u}}\sim H^2\log 1/T$, for a small but finite magnetic field $H$. Together with the previously reported anomalous specific heat $C$, this implies a quadrupolar Grüneisen ratio ${\Gamma }_u={\partial }_T{\epsilon }_{\mathrm{u}}/C\sim H^2/(T^2\log 1/T)$ whose divergence for finite $H$ is consistent with the scenario of a quadrupolar Kondo effect. In addition, we find a singular behavior of the isotropic strain ${\epsilon }_{\mathrm{B}}$ in zero magnetic field resulting in a divergence of both the volume thermal expansion and the volume Grüneisen parameter. We speculate that this behavior might be also induced by putative Kondo correlations via elastic anharmonicities or static strain disorder.

arXiv comment6 pages, 4 figures and supplemental material (10 pages, 6 figures)

References in corpus (15)

• Quantum Criticality in Heavy Fermion Metals
• Universally diverging Grueneisen parameter and the magnetocaloric effect close to quantum critical points
• Kondo Effects and Multipolar Order in the cubic PrTr2Al20 (Tr=Ti, V)
• Heavy Fermion Superconductivity in the Quadrupole Ordered State of PrV2Al20
• Quadrupole-Driven Non-Fermi Liquid and Magnetic-Field Induced Heavy Fermion States in a Non-Kramers Doublet System
• Unveiling Hidden Orders: Magnetostriction as a Probe of Multipolar-Ordered States
• Grüneisen parameter studies on heavy fermion quantum criticality
• Nematic Fluctuations in the Cuprate Superconductor Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Single-Site Non-Fermi Liquid Behaviors in a Diluted 4$f^2$ System Y${}_{1-x}$Pr${}_x$Ir${}_2$Zn${}_{20}$
• AC Elastocaloric effect as a probe for thermodynamic signatures of continuous phase transitions
• Nematic quantum criticality in an Fe-based superconductor revealed by strain-tuning
• Evidence for the Single-Site Quadrupolar Kondo Effect in the Dilute non-Kramers System Y${}_{1-x}$Pr${}_x$Ir${}_2$Zn${}_{20}$
• Critical theory of non-Fermi liquid fixed point in multipolar Kondo problem
• A uniaxial stress capacitive dilatometer for high-resolution thermal expansion and magnetostriction under multiextreme conditions
• Highly anisotropic strain dependencies in PrIr${}_2$Zn${}_{20}$

Cited by in corpus (3)

• Inelastic neutron scattering study of crystalline electric field excitations in the caged compounds NdT2Zn20 (T = Co, Rh, and Ir)
• Probing magnetic-field-induced multipolar ordering through field-angle-resolved magnetostriction and thermal expansion in PrIr${}_2$Zn${}_{20}$
• Paramagnetic electron-nuclear spin entanglement in HoCo2Zn20