Observation of field-induced single-ion magnetic anisotropy in a multiorbital Kondo alloy $(\mathrm{Lu},\mathrm{Yb}){\mathrm{Rh}}_2{\mathrm{Zn}}_{20}$

Abstract

We demonstrate field-induced single-ion magnetic anisotropy resulting from the multiorbital Kondo effect on the diluted ytterbium alloy $({\mathrm{Lu}}_{1-x}{\mathrm{Yb}}_x){\mathrm{Rh}}_2{\mathrm{Zn}}_{20}$. Single-ion anisotropic metamagnetic behavior is revealed in low-temperature regions where the local Fermi-liquid state is formed. Specific hea, low-field magnetic susceptibility, and resistivity indicate reproduction of the ground-state properties by the $\mathrm{SU}(N=8)$ Kondo model with a relatively large $c$-$f$ hybridization of $T_{\mathrm{K}}=60.9\mathrm{K}$. Dynamical susceptibility measurements on $\mathrm{Yb}{\mathrm{Rh}}_2{\mathrm{Zn}}_{20}$ support realizing the multiorbital Kondo ground state in $({\mathrm{Lu}}_{1-x}{\mathrm{Yb}}_x){\mathrm{Rh}}_2{\mathrm{Zn}}_{20}$. The single-ion magnetic anisotropy becomes evident above $\sim 5\mathrm{T}$, which is lower than the isotropic Kondo crossover field of 22.7 T, verifying blurred low-lying crystal field states through the multiorbital Kondo effect.

14 pages, 12 figures, 6 pages of supplementary material

References in corpus (4)

• Orbital Kondo effect in carbon nanotubes
• YSix closely related YbT${}_2$Zn${}_{20}$ (T = Fe, Co, Ru, Rh, Os, Ir) heavy fermion compounds with large local moment degeneracy
• Energy scales of Lu(1-x)Yb(x)Rh2Si2 by means of thermopower investigations
• Quantum Fluctuations along Symmetry Crossover in Kondo-correlated Quantum Dot