Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 3: Correlated Electrons: Quantum-Critical Phenomena
TT 3.5: Vortrag
Montag, 27. März 2006, 10:30–10:45, HSZ 301
Kondo lattice model with finite temperature Lanczos method — •Ivica Zerec, Burkhard Schmidt, and Peter Thalmeier — Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden
The full Kondo lattice model (KLM) including localized spins and itinerant electrons is considered on finite size clusters using finite temperature Lanczos method (FTLM). The method is numerically exact for the finite size clusters. The study is focused on the weak coupling limit, where the competition between the RKKY interaction and the Kondo screening is analyzed by means of correlation functions and thermodynamic properties. Special attention is devoted to the finite size effects, which are important in that limit. From the analysis of the cluster calculations we derive a phase diagram in the T-JK plane, where JK is the coupling of local and conduction electron spins. It is compared to the phase diagram for the KLM without charge degrees of freedom and the Doniach phase diagram.