Application of the SCR Spin Fluctuation Theory for the Magnetic Instability in Heavy Fermion System Ce_{<b>1-<i>x</i></b>}La_<i>x</i>Ru_<b>2</b>Si_<b>2</b>

Abstract

We have applied the self-consistent renormalized (SCR) spin fluctuation theory to calculate several physical quantities measured for Ce 1- x La x Ru 2 Si 2 ( x =0, 0.05 and 0.075), namely the specific heat, resistivity, thermal expansion, spin-lattice relaxation and inelastic neutron scattering. A quantitative agreement between experiments and the theory has been obtained in all cases, indicating that the spin fluctuations dominate the thermal and dynamical properties near the magnetic instability in this system. Comparisons are also made with the recent renormalization group approach to the quantum critical point in itinerant systems.