Abstract
The location and height of the susceptibility maximum for anisotropic one and two-dimensional spin S = 1 2 Heisenberg models are investigated by using the Green's function treatment within the random phase approximation. The results are fitted to the power law behaviors, T m χ - T 0 = ah γ and χ ( T m χ ) = bh - β , in the high field. And the exponents γ , β are found to be dependent of the anisotropy. Our results do not support the 2 3 power laws which are obtained from the mean-field Landau's theory. For the isotropic and Ising cases, the exponents γ , β which are in agreement with the results by other theoretic techniques.
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