Solution of two channel spin - flavor Kondo model
نویسنده
چکیده
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(NFL) fixed point; the thermodynamic quantities show NFL behaviors, but the transport quantities show fermi liquid (FL) behaviors . 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 SU(4) Coqblin-Schrieffer model is studied. The implications on the possible experiments are given. Typeset using REVTEX
منابع مشابه
On two channel flavor anisotropic Kondo model
Using Abelian Bosonization and Conformal Field Theory, we reinvestigate the two channel flavor anisotropic Kondo model where the two conduction electron channels couple to the impurity spin with different strength. All the possible fixed points of this model have been identified. It is shown that there is only one non-fermi liquid fixed point which is the two channel Kondo fixed point. The syst...
متن کامل5 S ep 1 99 6 Solution of two channel spin - flavor Kondo model
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 fermi-liq...
متن کاملExotic Kondo Effects in Metals: Magnetic Ions in a Crystalline Electric Field and Tunneling Centers
The ordinary single channel Kondo model consists of one or more spin 1/2 local moments interacting antiferromagnetically with conduction electrons in a metal. This model has provided a paradigm for understanding many phenomena of strongly correlated electronic materials, ranging from the formation of heavy fermion fermi liquids to the mapping to a one-band model in the cuprate superconductors. ...
متن کاملSpin-flavor separation and non-Fermi-liquid behavior in the multichannel Kondo problem: A large-N approach.
We consider a SU(N)×SU(M) generalization of the multichannel single-impurity Kondo model which we solve analytically in the limit N → ∞, M → ∞, with γ = M/N fixed. Non-Fermi liquid behavior of the single electron Green function and of the local spin and flavor susceptibilities occurs in both regimes, N ≤ M and N > M , with leading critical exponents identical to those found in the conformal fie...
متن کاملOn two channel flavor anisotropic and one channel compactified Kondo models
We reinvestigate the two channel flavor anisotropic model (2CFAK) and one channel compacitified Kondo model (1CCK). For these two models, all the possible fixed points and their symmetries are identified; the finite size spectra, the electron conductivity and pairing susceptibility are calculated. It is shown that the only non-fermi liquid (NFL) fixed point of the 2CFAK is the NFL of the two ch...
متن کامل