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Electronic State of the Anderson Lattice over the Whole Temperature Range

Earlier we proposed a modified version of the Anderson lattice model where the intersite coherence effects can be properly included even in the large limit of the spin-orbital degeneracy N and investigated the low temperature Fermi liquid properties rigorously in the limit N →∞. In the present study, using the same model as above, we investigate properties over the whole temperature range through explicit numerical calculations for N =6. We find that a coherence temperature T 0 of order of one tenth of the Kondo temperature T K exists; at lower temperature \(T\lesssim{T}_{0}\) the system is in the Fermi liquid state, while at higher temperature T ≫ T 0 the electrons are scattered incoherently by the Kondo impurities. At intermediate temperature, with increasing T , the hybridization gap appeared in the Fermi liquid state decreases rapidly at \(T\gtrsim{T}_{0}\), then smoothly turns into the pseudo gap at T ≃ T K , and finally the dense Kondo regime is realized at \(T\gtrsim{T}_{\text{K}}\).