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 language | English |
|---|---|
| Article number | 034719 |
| Journal | journal of the physical society of japan |
| Volume | 78 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - Mar 2009 |
| Externally published | Yes |
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)