APPLICATION OF THE SCR SPIN FLUCTUATION THEORY FOR THE MAGNETIC INSTABILITY IN HEAVY-FERMION SYSTEM CE1-XLAXRU2SI2

We have applied the self-consistent renormalized (SCR) spin fluctuatio n theory to calculate several physical quantities measured for Ce1-xLa xRu2Si2 (x = 0, 0.05 and 0.075), namely the specific heat, resistivity , thermal expansion, spin-lattice relaxation and inelastic neutron sca ttering. A quantitative agreement between experiments and the theory h as been obtained in all cases, indicating that the spin fluctuations d ominate the thermal and dynamical properties near the magnetic instabi lity in this system. Comparisons are also made with the recent renorma lization group approach to the quantum critical point ill itinerant sy stems.