Quenching of interacting moments and anomalous Fermi-liquid behavior in disordered Kondo alloys at low temperatures

The magnetic scattering rate of Kondo alloys with a finite concentration of magnetic impurities is measured by means of weak localization. The three investigated systems---Fe in Mg and Co on the surface of Mg and Cu---show magnetic interactions at liquid-helium temperatures. At much lower temperatures the magnetic scattering rate decreases drastically with a T1/2 temperature dependence in the experimental range. This suggests a cooperative effect between the differnt impurities which appears to suppress the magnetic moments, although the condition for a Landau Fermi liquid is not fulfilled.