Singular Effects of Impurities Near the Ferromagnetic Quantum-Critical Point
03 June 2002
Systematic theoretical results for the effects of a dilute concentration of magnetic impurities on the thermodynamic and transport properties in the region around the quantum critical point of a ferromagnetic transition are obtained. In the quasi-classical regime the Kondo effect is lost. In the quantum fluctuation regime the properties are those of a line of critical points of the multichannel Kondo problem with the number of channels continuously changing and diverging as the ferromagnetic phase transition is approached, except at unattainably low temperatures.