The anisotropic multichannel spin-$S$ Kondo model: Calculation of scales   from a novel exact solution
  A novel exact solution of the multichannel spin-$S$ Kondo model is presented, based on a lattice path integral approach of the single channel spin-1/2 case. The spin exchange between the localized moment and the host is of $XXZ$-type, including the isotropic $XXX$ limit. The free energy is given by a finite set of non-linear integral equations, which allow for an accurate determination of high- and low-temperature scales. 
M. Bortz and A. Kl\"umper