Abstract
We investigate a model where an impurity couples to both the spin and the flavor currents of the two-channel conduction electrons. This model can be used as a prototype model of a magnetic impurity tunneling between two sites in a metal, and of some heavy-fermion systems where the ground state of the impurity has a fourfold degeneracy. The system is shown to flow to a doubly degenerate non-Fermi-liquid fixed point; the thermodynamic quantities show NFL behaviors, but the transport quantities show Fermi-liquid (FL) behavior. A spin-flavor coupling double tensor term is shown to drive the system to one of the two singlet FL fixed points. The relation with the SU(4) Coqblin-Schrieffer model is studied. The implications for possible experiments are given.
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