Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1998-11-26
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 1 figure, Proceedings of the SCES98'Conference, Paris, july 98 to appear in Physics B (1999)
Scientific paper
10.1016/S0921-4526(98)00860-6
The dynamical spin susceptibility is studied in the magnetically-disordered phase of heavy-Fermion systems near the antiferromagnetic quantum phase transition. In the framework of the $S=1/2$ Kondo lattice model, we introduce a perturbative expansion treating the spin and Kondo-like degrees of freedom on an equal footing. The general expression of the dynamical spin susceptibility that we derive presents a two-component behaviour: a quasielastic peak as in a Fermi liquid theory, and a strongly q-dependent inelastic peak typical of a non-Fermi liquid behaviour. Very strikingly, the position of the inelastic peak is found to be pushed to zero at the antiferromagnetic transition with a vanishing relaxation rate. The comparison has been quantitatively made with Inelastic Neutron Scattering (INS) experiments performed in $CeCu_{6}$ and $Ce_{1-x}La_{x}Ru_{2}Si_{2}$. The excellent agreement that we have found gives strong support to a two-band model with new prospects for the study of the quantum critical phenomena in the vicinity of the magnetic phase transition.
Lavagna Michele
Pepin Catherine
No associations
LandOfFree
Spin Dynamics near the Quantum Critical Point of Heavy-Fermions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Spin Dynamics near the Quantum Critical Point of Heavy-Fermions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spin Dynamics near the Quantum Critical Point of Heavy-Fermions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-626770