Critical properties of the Fermi-Bose Kondo and pseudogap Kondo models: Renormalized perturbation theory
arXiv:cond-mat/0312150 · doi:10.1103/PhysRevB.69.174421
Abstract
Magnetic impurities coupled to both fermionic and bosonic baths or to a fermionic bath with pseudogap density of states, described by the Fermi-Bose Kondo and pseudogap Kondo models, display non-trivial intermediate coupling fixed points associated with critical local-moment fluctuations and local non-Fermi liquid behavior. Based on renormalization group together with a renormalized perturbation expansion around the free-impurity limit, we calculate various impurity properties in the vicinity of those intermediate-coupling fixed points. In particular, we compute the conduction electron T matrix, the impurity susceptibility, and the residual impurity entropy, and relate our findings to certain scenarios of local quantum criticality in strongly correlated lattice models.
arXiv comment16 pages, 5 figs; (v2) large-N results for entropy of Bose-Kondo model added; (v3) final version as published
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