The pseudogap Fermi-Bose Kondo model

Abstract

We consider a magnetic impurity coupled to both fermionic quasiparticles with a pseudogap density of states and bosonic spin fluctuations. Using renormalization group and large-N calculations we investigate the phase diagram of the resulting Fermi-Bose Kondo model. We show that the Kondo temperature is strongly reduced by low-energy spin fluctuations, and make connections to experiments in cuprate superconductors. Furthermore we derive an exact exponent for the critical behavior of the conduction electron T matrix, and propose our findings to be relevant for certain scenarios of local quantum criticality in heavy-fermion metals.

4 pages, 3 figs, (v2) conclusions regarding EDMFT modified, (v3) final version as published

References in corpus (1)

• Quantum phase transitions in the Bose-Fermi Kondo model

Cited by in corpus (7)

• Phase transitions in the pseudogap Anderson and Kondo models: Critical dimensions, renormalization group, and local-moment criticality
• Upper-critical dimension in a quantum impurity model: Critical theory of the asymmetric pseudogap Kondo problem
• Quantum critical properties of the Bose-Fermi Kondo Model in a large-N limit
• Quantum Criticality in Ferromagnetic Single-Electron Transistors
• Critical properties of the Fermi-Bose Kondo and pseudogap Kondo models: Renormalized perturbation theory
• Kondo screening in unconventional superconductors: The role of anomalous propagators
• Numerical Renormalization Group for Impurity Quantum Phase Transitions: Structure of Critical Fixed Points