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 ${\mathrm{T}}^{1/2}$ 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.