The kondo lattice model in infinite dimensions: II. static susceptibilities and phase diagram

Junya Otsuki, Hiroaki Kusunose, Yoshio Kuramoto

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Magnetic and charge susceptibilities in the Kondo lattice are derived by the continuous-time quantum Monte Carlo (CT-QMC) method combined with the dynamical mean-field theory. For a weak exchange coupling J and near half filling of the conduction band, antiferromagnetic transition occurs as signalled by divergence of the staggered magnetic susceptibility with lowering temperature. With increasing J, the Kondo effect suppresses the divergence, and the critical value of J agrees well with Doniach's estimate which considers the RKKY interaction as competing with the Kondo effect. For low density of conduction electrons, a ferromagnetic ordering is observed where Doniach's estimate does not work. Around quarter filling, a charge-density-wave (CDW) transition is found. The CDW is interpreted from the strong-coupling limit in terms of effective repulsion between Kondo singlets.

Original languageEnglish
Article number034719
Journaljournal of the physical society of japan
Volume78
Issue number3
DOIs
Publication statusPublished - Mar 1 2009
Externally publishedYes

Keywords

  • Charge-density wave (CDW)
  • Continuous-time quantum Monte Carlo method (CT-QMC)
  • Doniach's phase diagram
  • Dynamical mean-field theory (DMFT)
  • Hypercubic lattice
  • Kondo lattice model

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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