title: 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.
authors.affiliation: IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany.
authors.forename: Steffen
authors.initials: S
authors.lastname: Sykora
authors.forename: Klaus W
authors.initials: KW
authors.lastname: Becker
references.citation: Phys Rev Lett. 1989 Jan 16;62(3):324-327
references.pmid: 10040203
references.citation: Phys Rev Lett. 2000 Feb 14;84(7):1535-8
references.pmid: 11017561
references.citation: Phys Rev Lett. 1992 Jul 6;69(1):168-171
references.pmid: 10046216
references.citation: Proc Jpn Acad Ser B Phys Biol Sci. 2006 Dec;82(9):328-38
references.pmid: 25792794
references.citation: Phys Rev Lett. 2009 Jan 9;102(1):017202
references.pmid: 19257234
references.citation: Phys Rev Lett. 1996 Jan 8;76(2):279-282
references.pmid: 10061061
references.citation: Phys Rev B Condens Matter. 1993 Feb 1;47(5):2886-2889
references.pmid: 10006353