Abstract
A Bethe ansatz solution of a (modified) Hubbard chain with a Kondo impurity of arbitrary spin S at ahighly symmetric line of parameter space is proposed and explored. Our results confirm theexistence of a strong-coupling (line of) fixed-point(s) with ferromagnetic Kondo couplingas first hypothetized by Furusaki andNagaosa on the basis of perturbative renormalization group calculations.For on-site Hubbard repulsion andferromagnetic Kondo exchange, the ground state has spin S − 1/2,i.e., is a singlet when S = 1/2.The contributions of theimpurity to the magnetic susceptibility and low-temperaturespecific heat are discussed. While the Wilson ratio is unity in the half-filled band, it is found to be a function of density and interaction away from half-filling.
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