Low energy properties of M-state tunneling systems in metals: New candidates for non-Fermi-liquid systems

Abstract

We construct a generalized multiplicative renormalization group transformation to study the low energy dynamics of a heavy particle tunneling among $M$ different positions and interacting with $N_f$ independent conduction electron channels. Using a $1/N_f$-expansion we show that this M-level scales towards a fixed point equivalent to the $N_f$ channel $SU(M)\times SU(N_f)$ Coqblin-Schrieffer model. Solving numerically the scaling equations we find that a realistic M-level system scales close to this fixed point (FP) and its Kondo temperature is in the experimentally observable range $1-10K$.

11 Latex pages, to appear in Phys. Rev. Lett, Figures available from the author by request

References in corpus (4)

• Spin-Flavor Separation and Non-Fermi Liquid Behavior in the Multichannel Kondo Problem: A Large N Approach
• Nonlinear Conductance for the Two Channel Anderson Model
• Knight Shift Anomalies in Heavy Electron Materials
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• Exotic Kondo effect from magnetic trimers
• The 2-Channel Kondo Model II: CFT Calculation of Non-Equilibrium Conductance through a Nanoconstriction containing 2-Channel Kondo Impurities
• Orbital fluctuations and strong correlations in quantum dots
• Intermediate coupling fixed point study in the overscreened regime of generalized multichannel SU(N) Kondo models
• Orbital Kondo behavior from dynamical structural defects
• Stable two-channel Kondo fixed point of an SU(3) quantum defect in a metal: renormalization group analysis and conductance spikes