Interaction effects in mixed-valent Kondo insulators

Abstract

We study theoretically the class of mixed-valent Kondo insulators, employing a recently developed local moment approach to heavy Fermion systems using the asymmetric periodic Anderson model (PAM). Novel features in spectra and transport, observable experimentally but lying outside the scope of the symmetric PAM or the Kondo lattice model, emerge naturally within the present theory. We argue in particular that a shoulder-like feature in the optical conductivity, that is distinct from the usual mid-infrared or direct gap peak and has been observed experimentally in mixed-valent compounds such as CeOs4Sb12 and YbAl3, is of intrinsic origin. Detailed comparison is made between the resultant theory and transport/optical experiments on the filled-skutterudite compound CeOs4Sb12, and good agreement is obtained.

14 pages, 7 figures

References in corpus (17)

• Anomalous Normal-State Properties of High-T${}_c$ Superconductors -- Intrinsic Properties of Strongly Correlated Electron Systems?
• Transport properties in CeOs${}_4$Sb${}_{12}$: Possibility of the ground state being semiconducting
• Anderson impurities in gapless hosts: comparison of renormalization group and local moment approaches
• A Local Moment Approach to magnetic impurities in gapless Fermi systems
• Pseudogap Formation and Heavy Carrier Dynamics in Intermediate Valence YbAl3
• Field-dependent dynamics of the Anderson impurity model
• Dynamics and transport properties of Kondo insulators
• Single-particle dynamics of the Anderson model: a local moment approach
• On the scaling spectrum of the Anderson impurity model
• Dynamics and scaling in the periodic Anderson model
• Kondo insulators in the periodic Anderson model: a local moment approach
• Dynamics and transport properties of heavy fermions: theory
• Magnetic properties of the Anderson model: a local moment approach
• Optical and transport properties of heavy fermions: theory compared to experiment
• Local quantum phase transition in the pseudogap Anderson model: scales, scaling and quantum critical dynamics
• Spectral scaling and quantum critical behaviour in the pseudogap Anderson model
• Finite temperature dynamics of the Anderson model

Cited by in corpus (3)

• A local moment approach to the degenerate Anderson impurity model
• From mixed valence to the Kondo lattice regime
• Mott transitions in the Periodic Anderson Model