期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 78, 期 3, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.78.034719
关键词
Kondo lattice model; charge-density wave (CDW); Doniach's phase diagram; continuous-time quantum Monte Carlo method (CT-QMC); dynamical mean-field theory (DMFT); hypercubic lattice
资金
- Japan Society for the Promotion of Science
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 tilling, 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.
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