Abstract
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 La 2− x Sr x CuO 4 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 δ( x) ≈ 2 x; in the region x ≈ 0.16–0.18, where higher critical temperatures are experimentally observed, the magnitude starts to decrease and vanishes at x ≈ 0.27, where superconductivity experimentally disappears.
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