Instability of non-fermi liquid behavior in the two-channel Kondo model

The effects of interchannel scattering of conduction electrons by the impur ity and repulsion of conduction electrons at the impurity site on the two-c hannel Kondo model are simultaneously considered in this paper. It is shown that these two perturbations will substantially modify the usual local non -Fermi liquid behavior of the two-channel Kondo model. With bosonization an d unitary transformations we find that the system can be transformed into a single channel Kondo model with anisotropy between longitudinal and transv erse exchange couplings. Whatever for originally antiferromagnetic or ferro magnetic isotropic coupling, the system always hows to strong-coupling limi t, which exhibits local Fermi liquid behavior at low temperatures.