Local moments coupled to a strongly correlated electron chain

S. Moukouri, Liang Chen, L. Caron

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

A one-dimensional model Hamiltonian that is motivated by the recent discovery of the heavy-fermion behavior in the cuprates of the (Formula presented)Cu(Formula presented) type is studied. It consists of (Formula presented) interacting conduction electrons coupled to a lattice of localized spins through a Kondo exchange term (Formula presented). Exact diagonalization and density-matrix renormalization-group methods are used. The latter method is generalized to arbitrary densities. At half filling, a spin gap opens for all (Formula presented). Away from half filling it is shown that, at strong (Formula presented), the ground state is an unsaturated ferromagnet. At weak (Formula presented) the system is in a paramagnetic phase with enhanced Ruderman-Kittel-Kasuya-Yosida (RKKY) correlations. The importance of self-screening of the local moments in the depletion regime is discussed. We argue that these findings transcend the specifics of the model.

Original languageEnglish
Pages (from-to)R488-R491
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume53
Issue number2
DOIs
StatePublished - 1 Jan 1996
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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