TY - JOUR
T1 - The kondo lattice model in infinite dimensions
T2 - II. static susceptibilities and phase diagram
AU - Otsuki, Junya
AU - Kusunose, Hiroaki
AU - Kuramoto, Yoshio
N1 - Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2009/3
Y1 - 2009/3
N2 - 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.
AB - 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.
KW - Charge-density wave (CDW)
KW - Continuous-time quantum Monte Carlo method (CT-QMC)
KW - Doniach's phase diagram
KW - Dynamical mean-field theory (DMFT)
KW - Hypercubic lattice
KW - Kondo lattice model
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U2 - 10.1143/JPSJ.78.034719
DO - 10.1143/JPSJ.78.034719
M3 - Article
AN - SCOPUS:62549133579
VL - 78
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 3
M1 - 034719
ER -