Finite temperature properties of the 2D Kondo lattice model

Details Finite temperature properties of the 2D Kondo lattice model Finite temperature properties of the 2D Kondo lattice model

1999-08-30

arxiv.org/abs/cond-mat/9908446v1

Physics

Condensed Matter

Strongly Correlated Electrons

REVTeX, 7 pages, 7 figures

Scientific paper

10.1103/PhysRevB.61.2482

Using recently developed Lanczos technique we study finite-temperature properties of the 2D Kondo lattice model at various fillings of the conduction band. At half filling the quasiparticle gap governs physical properties of the chemical potential and the charge susceptibility at small temperatures. In the intermediate coupling regime quasiparticle gap scales approximately linearly with Kondo coupling. Temperature dependence of the spin susceptibility reveals the existence of two different temperature scales. A spin gap in the intermediate regime leads to exponential drop of the spin susceptibility at low temperatures. Unusual scaling of spin susceptibility is found for temperatures above 0.6 J. Charge susceptibility at finite doping reveals existence of heavy quasiparticles. A new low energy scale is found at finite doping.

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