Magnetic properties of the two-dimensional Hubbard model

The spin magnetic susceptibility for the two-dimensional one-band Hubbard model is calculated by means of the composite operator method. The results are in qualitative agreement with the experimental situation in La2-xSrxCuO4 systems. When the system is doped away from half-filling, incommensurate magnetism is observed; the magnitude of incommensurability increases on increasing the hole concentration, following quite well the experimental law delta(x) approximate to 2x; in the region x approximate to 0.16-0.18, where higher critical temperatures are experimentally observed. the magnitude starts to decrease and vanishes at x approximate to 0.27, where superconductivity experimentally disappears.