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The symmetric periodic Anderson model is well known to capture the essentialphysics of Kondo insulator materials. Within the framework of dynamicalmean-field theory, we develop a local moment approach to its single-particledynamics in the paramagnetic phase. The approach is intrinsicallynon-perturbative, encompasses all energy scales and interaction strengths, andsatisfies the low-energy dictates of Fermi liquid theory. It captures inparticular the strong coupling behaviour and exponentially small quasiparticlescales characteristic of the Kondo lattice regime, as well as simpleperturbative behaviour in weak coupling. Particular emphasis is naturally givento strong coupling dynamics, where the resultant clean separation of energyscales enables the scaling behaviour of single-particle spectra to be obtained.Comment: 15 pages, 10 postscript figures, accepted for publication in EPJ B;  HyperTex disable

Kondo insulators in the periodic Anderson model: a local moment approach