We investigate the anomalous metal arising by hole doping the Mott insulating
state of the periodic Anderson model. Using Dynamical Mean-Field Theory we show
that, as opposed to the electron-doped case, in the hole-doped regime the
hybridization between localized and delocalized orbitals leads to the formation
of composite quasi-particles reminiscent of the Zhang-Rice singlets. We compute
the coherence temperature of this state, showing its exponentially small value
at low dopings. As a consequence the weakly-doped Mott state deviates from the
predictions of Fermi-liquid theory already at small temperatures. The onset of
the Zhang-Rice state and of the consequent poor coherence is due to the
electronic structure in which both localized and itinerant carriers have to be
involved in the formation of the conduction states and to the proximity to the
Mott state. By investigating the magnetic properties of this state, we discuss
the relation between the anomalous metallic properties and the behavior of the
magnetic degrees of freedom.Comment: 12 pages, 14 figure