MAGNETIC-SUSCEPTIBILITY OF THE 2-DIMENSIONAL HUBBARD-MODEL

Using quantum Monte Carlo techniques we study the magnetic susceptibility of the Hubbard model on a two-dimensional square lattice for values of the coupling U/t ranging from 4 to 20, and as a function of temperature and doping. For U/t = 4 the magnetic susceptibility has a maximum at half filling and decreases with doping, in qualitative agreement with recent random-phase-approximation calculations. However, for U/t = 10 the susceptibility increases with hole doping near half filling resembling the experimental results obtained for La2-xSrxCuO4. At low electronic density the temperature dependence of the susceptibility is compatible with that of a Fermi liquid.