Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-06-23
Phys. Rev. B 84, 115105 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages
Scientific paper
10.1103/PhysRevB.84.115105
We study the Anderson lattice model with one f-orbital per lattice site as the simplest model which describes generic features of heavy fermion materials. The resistivity and magnetic susceptibility results obtained within dynamical mean field theory (DMFT) for a nearly half-filled conduction band show the existence of a single energy scale $T^*$ which is similar to the single ion Kondo temperature $T_K^o$. To determine the importance of inter-site correlations, we have also solved the model within cellular DMFT (CDMFT) with two sites in a unit cell. The antiferromagnetic region on the phase diagram is much narrower than in the single-site solution, having a smaller critical hybridization $V_c$ and N\'eel temperature $T_N$. At temperatures above $T_N$ the nonlocal correlations are small, and the DMFT paramagnetic solution is in this case practically exact, which justifies the ab initio LDA+DMFT approach in theoretical studies of heavy fermions. Strong inter-site correlations in the CDMFT solution for $T
Dobrosavljevic Vlad
Haule Kristjan
Kotliar Gabriel
Tanaskovic Darko
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