Heavy fermion properties of the Kondo Lattice model.

Abstract:

:We study the S = 1/2 Kondo lattice model which is widely used to describe heavy fermion behavior. In conventional treatments of the model the Kondo interaction is decoupled in favour of a hybridization of conduction and localized f electrons. However, such an approximation breaks the local gauge symmetry and implicates that the local f-occupation is no longer conserved. To avoid these problems, we use in this work an alternative approach to the model based on the Projective Renormalization Method (PRM). Thereby, within the conduction electron spectral function we identify the lattice Kondo resonance as an almost flat excitation near the Fermi surface which is composed of conduction electron creation operators combined with localized spin fluctuations. This leads to an alternative description of the Kondo resonance without having to resort to an artificial symmetry breaking.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Sykora S,Becker KW

doi

10.1038/srep02691

subject

Has Abstract

pub_date

2013-01-01 00:00:00

pages

2691

issn

2045-2322

pii

srep02691

journal_volume

3

pub_type

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