Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-12-05
Phys. Rev. B 69, 174421 (2004)
Physics
Condensed Matter
Strongly Correlated Electrons
16 pages, 5 figs; (v2) large-N results for entropy of Bose-Kondo model added; (v3) final version as published
Scientific paper
10.1103/PhysRevB.69.174421
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.
Kircan Marijana
Vojta Matthias
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