Critical properties of the Fermi-Bose Kondo and pseudogap Kondo models: Renormalized perturbation theory

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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.
16 pages, 5 figs; (v2) large-N results for entropy of Bose-Kondo model added; (v3) final version as published

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Strongly Correlated Electrons, Superconductivity

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http://salesiana.dossiersoluciones.com/handle/123456789/22859

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0312150
 http://arxiv.org/abs/cond-mat/0312150
 Phys. Rev. B 69, 174421 (2004)
 doi:10.1103/PhysRevB.69.174421

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arXiv