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

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Cited by in corpus (24)

• Quantum Criticality in Heavy Fermion Metals
• Quantum phase transitions
• Impurity Quantum Phase Transitions
• Quantum phase transitions in the sub-ohmic spin-boson model: Failure of the quantum-classical mapping
• 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
• Universal crossovers and critical dynamics of quantum phase transitions: A renormalization group study of the pseudogap Kondo problem
• Quantum Criticality in Ferromagnetic Single-Electron Transistors
• Critical properties of the Fermi-Bose Kondo and pseudogap Kondo models: Renormalized perturbation theory
• Quantum phase transitions and thermodynamics of the power-law Kondo model
• Quantum criticality in the pseudogap Bose-Fermi Anderson and Kondo models: Interplay between fermion- and boson-induced Kondo destruction
• Fixed point annihilation for a spin in a fluctuating field
• Kondo screening in unconventional superconductors: The role of anomalous propagators
• Quantum phase transitions in a resonant-level model with dissipation: Renormalization-group studies
• Numerical Renormalization Group for Impurity Quantum Phase Transitions: Structure of Critical Fixed Points
• Impurity resonant state in d-wave superconductors: in favor of a Kondo-like response
• Quantum Chaos of the Bose-Fermi Kondo model at the intermediate temperature
• Kondo physics in a dissipative environment
• An equation of state for expanded metals
• Quantum criticality in the spin-isotropic pseudogap Bose-Fermi Kondo model: entropy, scaling, and the g-theorem
• Emergent soft-gap Anderson models at quantum criticality in a lattice Hamiltonian within dynamical mean field theory
• Tunable phase transition in a dissipative two-spin system: A renormalization group study
• Boundary quantum criticality in models of magnetic impurities coupled to bosonic baths