Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 28: Correlated Electrons: General Theory
TT 28.1: Vortrag
Donnerstag, 30. März 2006, 10:00–10:15, HSZ 301
Transport and optical properties of the Kondo lattice model — •Theo Costi — Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich
Dynamical mean field theory is used to investigate transport and optical properties of the Kondo lattice model as a function of increasing hole doping around the Kondo insulating state. The two low energy scales of the model [1,2,3], the lattice coherence scale or single-ion Kondo scale, and the Fermi liquid coherence scale, are identified in spectral, transport, and optical properties. The gaps in transport and optics for Kondo insulators are identified and compared with those found by other approaches. The temperature dependence of the resistivity and frequency dependent optical conductivity is described. Close to the Kondo insulating state we find an incoherent metallic behaviour. Dynamical mean field theory is shown to provide a straightforward interpretation of the resistivity of such prototypical paramagnetic heavy fermion systems as CeAl3.
[1] Pruschke, Th., R. Bulla, and M. Jarrell, 2000, Phys. Rev. B 61, 12799.
[2] S. Burdin, A. Georges, D. R. Grempel, Phys. Rev. Lett. 85, 1048-1051 (2000).
[3] T. A. Costi and N. Manini, J. Low Temp. Phys. 126, 835 (2002).