We have studied the low temperature properties of PrPb3 and PrInAg2 with the crystal-electric-field ground state of a non-Kramers Γ3 doublet diluted by non-magnetic La ions to examine the correlation between the Γ3 quadrupolar moments and the conduction electrons. In PrxLa1-xPb3, a non-Fermi liquid (NFL) behavior is observed at Pr concentrations of x≤0.05. The specific heat C/T increases monotonically below T=1.5 K, which can be scaled with a characteristic temperature T* defined at each concentration x. Application of magnetic field raises C/T rapidly, which demonstrates the presence of the residual entropy at lower temperatures. In PrxLa 1-xInAg2, NFL behavior is confirmed for x=0.05 and 0.1 in the susceptibility below 15 K and in the specific heat below 7 K. It is supposed that the Kondo effect arising from the correlation between the dilute Γ3 moments and the conduction electrons gives rise to NFL behavior in both systems.
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry