Finite-temperature properties of the two-dimensional Kondo lattice model

Using the recently developed Lanczos technique we study finite-temperature properties of the 2D Rondo lattice model at various fillings of the conduct ion band. At half filling the quasiparticle gap governs physical properties of the chemical potential and the charge susceptibility at small temperatu res. In the intermediate coupling regime quasiparticle gap scales approxima tely linearly with the Kondo coupling as Delta(qp)similar to 0.3S, Temperat ure dependence of the spin susceptibility seems to reveal two different tem perature scales. A spin gap in the intermediate regime leads to a drop of t he spin susceptibility at low temperatures, while a settling of spin suscep tibility is found for temperatures above T-c greater than or equal to 0.6J. Charge susceptibility at finite doping reveals existence of heavy quasipar ticles. A low energy scale is found at finite doping.