摘要
To specify the difference between the one-dimensional Kondo problem and the three-dimensional Kondo problem,we consider a model which describes the interaction between one-dimensional free electrons and a magnetic impurity.Bethe ansatz exact results and scaling analysis show that if J_(F)>-|J_(B)|,the Kondo screening occurs.There is no ferromagnetic Kondo screening in such a system but the long range antiferromagnetic Kondo coupling is relevant.As soon as the Coulomb interaction is introduced,the crossovers between the scaling trajectories in the parameter region J_(F)<-|J_(B)|and the trajectories in other parameter regions arise and ferromagnetic Kondo screening may occur.
