Highly anisotropic strain dependencies in PrIr${}_2$Zn${}_{20}$

Abstract

We report thermal expansion and magnetostriction of the cubic non-Kramers system PrIr${}_2$Zn${}_{20}$ with a non-magnetic ${\Gamma }_3$ ground state doublet. In previous experiments, antiferroquadrupolar order at \hbox{$T_{\mathrm{Q}}=0.11$\,K} and a Fermi liquid state around $B_{\mathrm{c}}\approx 5$\,T for \hbox{$\mathbf{B}\parallel [001]$}, indicative of possible ferrohastatic order, were discovered. For magnetic fields \hbox{$\mathbf{B}\parallel [001]$}, the low temperature longitudinal and transverse thermal expansion and magnetostriction are highly anisotropic. The resulting volume strain is very small, indicating that the Pr valence remains nearly constant as a function of magnetic field. We conclude that the Fermi liquid state around $B_{\mathrm{c}}$ forms through a very little change in c-f hybridization. This result is in sharp contrast to Ce- and Yb-based Kramers Kondo lattices which show significantly larger volume strains due to the high sensitivity of the Kondo temperature to hydrostatic pressure.

8 pages, 8 figures

References in corpus (5)

• Quantum Criticality in Heavy Fermion Metals
• Heavy Fermion Superconductivity in the Quadrupole Ordered State of PrV2Al20
• Hastatic Order in URu2Si2
• Quadrupole-Driven Non-Fermi Liquid and Magnetic-Field Induced Heavy Fermion States in a Non-Kramers Doublet System
• Grüneisen parameter studies on heavy fermion quantum criticality

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• Anisotropy of the magnetic-field-induced phase pocket in the non-Kramers doublet system PrIr${}_2$Zn${}_{20}$
• Probing magnetic-field-induced multipolar ordering through field-angle-resolved magnetostriction and thermal expansion in PrIr${}_2$Zn${}_{20}$