NON-FERMI-LIQUID STATES IN A GENERALIZED 2-CHANNEL KONDO MODEL

Using the numerical renormalization group method, we study a generaliz ed two-channel Kondo model where the impurity has a quadrupole moment (pseudospin) and a magnetic moment(flavor). This model may be of relev ance to the Ce ions in CeB6 and the Cu ions in cuprate superconductors . We find that the nontrivial fixed point of the two-channel Kondo mod el is unstable against flavor exchange coupling. The system flows to a non-Fermi-liquid fixed line. In the presence of a double tenser inter action, which breaks particle-hole symmetry, the system flows to a Fer mi-liquid fixed line.