Phase Diagram, Energy Scales and Nonlocal Correlations in the Anderson Lattice Model

Tanaskovic, Darko and Haule, K and Kotliar, G and Dobrosavljevic, V (2011) Phase Diagram, Energy Scales and Nonlocal Correlations in the Anderson Lattice Model. Physical Review B, 84 (11). p. 115105. ISSN 1098-0121 (FP7- 261323)

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Abstract

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 o K. 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 Vc and N´eel temperature TN. At temperatures above TN 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 < TN, however, indicate that they have to be properly treated in order to unravel the physical properties near the quantum critical point.

Item Type:	Article
FP7 Grant Agreement Number:	261323
FrameWork Programmes:	SP4-Capacities
Scientific Areas:	Research Infrastructures
Last Modified:	08 Aug 2012 10:14
Access rights:	Open access
URI:	http://eprints.kobson.nb.rs/id/eprint/8

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