We have studied the pressure dependence of the specific heat for PrPb 3 and La-diluted system Pro.97Lao.o3Pb 3. In PrPb3, the quadrupolar ordering temperature at Tq=0.4 K rises by δT=10 mK at P=0.66 GPa. In Pr0.97La 0.03Pb3, in which the quadrupolar ordering disappears by the La substitution, the specific heat C varies with increasing pressure. C/T below 0.3 K is nearly constant at low pressures, while C/T increases gradually with decreasing temperature at P=0.88 GPa. These results can be explained by the pressure dependence of the intersite interaction between the Γ3 moments and that of the interaction between the rΓ3 moments and the conduction electrons.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)