Effective Magnetic Moments of Heavy Fermions and the Wilson Ratio for Kondo Lattices

The formation of heavy-fermion bands is discussed on the basis of the relativistic Korringa-Kohn-Rostoker equation. It is shown that only one specific linear combination of six local $f$ states can hybridize with a conduction state of given $\mathbf{k}$ and spin. It follows that the magnetic moments of the heavy fermions are sharply quenched. The Wilson ratios calculated from these effective magnetic moments fit experimental data much better than without this correction.