Multiorbital Kondo effect in a diluted-Yb system (Lu,Yb)RhZn

Kitazawa, Takafumi  

To verify the multiorbital Kondo effect in impurity alloy systems, we focused on the Yb-based compound YbRhZn. Inelastic neutron scattering experiments on YbRhZn revealed a local minimum in the temperature dependence of the quasielastic scattering linewidth, suggesting the occurrence of the multiorbital Kondo effect. In the magnetic impurity system LuYbRhZn (), macroscopic physical properties exhibit local Fermi-liquid behavior, a local maximum in magnetic susceptibility, and upward curvature of the magnetization curves. Furthermore, the Wilson ratio, which is proportional to the ratio of magnetic susceptibility in the low temperature limit to the electronic specific heat coefficient, indicates a large quasiparticle degeneracy of . These results in LuYbRhZn () provide evidence for the multiorbital Kondo effect in magnetic impurity systems.