Screening effect on the multipole moments in the Kondo system

We have performed specific heat, ultrasound, and magnetoresistivity measurements examining the dense Kondo system (Formula presented) The results obtained support the view that in the case of (Formula presented) a nonmagnetic state (the Kondo nonmagnetic state) exists due to the dense Kondo effect under low-temperature and low-field conditions. We have identified two characteristic temperatures in (Formula presented) One is the Kondo temperature (Formula presented) and the other is (Formula presented) which denotes the binding energy for the electric quadrupolar cancellation. In the (Formula presented) system, (Formula presented) is strongly dependent on the Ce concentration, whereas (Formula presented) is almost independent of it. The present results strongly suggest that phase IV exists in the range of (Formula presented) The low-temperature specific heat of (Formula presented) in phase IV was found to be in proportion to (Formula presented) and this is difficult to interpret in terms of antiferromagnetic ordering. The appearance of phase IV may arise from the pronounced discrepancy between (Formula presented) and (Formula presented).