Abstract
We study theoretically the class of mixed-valent Kondo insulators, employing a recentlydeveloped local moment approach to heavy Fermion systems using the asymmetric periodicAnderson model (PAM). Novel features in spectra and transport, observable experimentallybut lying outside the scope of the symmetric PAM or the Kondo lattice model, emergenaturally within the present theory. We argue in particular that a shoulder-like feature inthe optical conductivity, that is distinct from the usual mid-infrared or direct gappeak and has been observed experimentally in mixed-valent compounds such asCeOs4Sb12 and YbAl3, is of intrinsic origin. Detailed comparison is made between the resultanttheory and transport/optical experiments on the filled-skutterudite compoundCeOs4Sb12, and good agreement is obtained.
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