Dynamic spin-correlation function near the antiferromagnetic quantum phase transition of heavy fermions

Article

关键词: ANDERSON LATTICE MODEL;    KONDO-LATTICE;    NEUTRON-SCATTERING;    MAGNETIC CORRELATIONS;    LIQUID BEHAVIOR;    VARIATIONAL THEORY;    GROUND-STATE;    FLUCTUATIONS;    SYSTEMS;    SUPERCONDUCTIVITY;   

DOI  :  10.1103/PhysRevB.59.2591

来源: SCIE

【 摘 要 】

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 dynamical spin susceptibility displays a two-component behavior in agreement with the inelastic neutron scattering (INS) experiments performed in CeCu6, Ce1-xLaxRu2Si2, ana UPt3 : a quasielastic q-independent peak as in a Fermi-liquid theory, and a strongly q-dependent inelastic peak typical of a non-Fermi-liquid behavior. Very strikingly, the position of the inelastic peak is found to be pushed to zero at the antiferromagnetic transition. The picture is consistent with the neutron cross sections observed in INS experiments. [S0163-1829(99)13603-8].

【 授权许可】

Free