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An electron scattering from a local impurity spin has its density of states altered by spin-flip scattering. This phenomenon causes a peak in the local density of states, which is called the ``Kondo resonance.'' We propose a simple formula for the shape of this resonance. For a dilute Kondo system, we use Fermi-liquid theory to calculate the effect of the Kondo resonance on the heat capacity, magnetic susceptibility, and resistivity. Good agreement is found when compared to exact solutions.
H. O. Frota (Wed,) studied this question.